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My Yu-Gi-Oh Fanfic Season 4 Part 3's Episode Cards

1. Card info below excludes the rarity for consistancy. Card effects are also paraphrased from their original effects.
2. Cards below are from the time they were released so the info may differ from the links below.
3. Cards below are generally played using the rules of this game.
The Spirit of the Millennium Ring Returns (Part 2)
Turn 6: Yami Bakura
Spirit Message "I"
(Continuous Spell)
Only placed on the field using the effect of "Destiny Board".
More info: https://yugipedia.com/wiki/Spirit_Message_%22I%22
Turn 7: Yami Marik
Malevolent Catastrophe
(Normal Trap)
Destroys all Spell and Trap Cards on the field when an opponent's monster attacks.

More info: https://yugipedia.com/wiki/Malevolent_Catastrophe
Turn 8: Yami Bakura
The Dark Door
(Continuous Spell)
Prevents both players from attacking with more than one monster for their Battle Phases.
More info: https://yugipedia.com/wiki/The_Dark_Door
Turn 9: Yami Marik
Lekunga
WATER / Effect Monster / Level 4 / ATK 1700 / DEF 500
(Plant / Effect)
Can Special Summon 1 Level 2 WATER "Lekunga Token" with 700 ATK and DEF to your field by banishing 2 WATER monsters from your Grave.

More info: https://yugipedia.com/wiki/Lekunga
Turn 10: Yami Bakura
Dark Necrofear
DARK / Effect Monster / Level 8 / ATK 2200 / DEF 2800
(Fiend / Effect)
1. First Special Summoned from your hand to your field by banishing 3 Fiend monsters from your Grave. 2. Equips to an opponent's monster and gives you control of it if destroyed while in the Monster Card Zone.
More info:
https://yugipedia.com/wiki/Dark_Necrofear
Turn 11: Yami Marik
Lava Golem
FIRE / Effect Monster / Level 8 / ATK 3000 / DEF 2500
(Fiend / Effect)
1. First Special Summoned from your hand to the opponent's field by Tributing 2 of their monsters, but prevents you from Normal Summoning or Setting monsters that turn.
2.
Deals the controller 1000 damage at their Standby Phases.
More info: https://yugipedia.com/wiki/Lava_Golem
Turn 12: Yami Bakura
Jowgen the Spiritualist
LIGHT / Effect Monster / Level 3 / ATK 200 / DEF 1300
(Spellcaster / Effect)
1. Can destroy all Special Summoned monsters on the field by discarding 1 random card. 2. Prevents both players from Special Summoning monsters to their field.
More info: https://yugipedia.com/wiki/Jowgen_the_Spiritualist
Turn 13: Yami Marik
Ring of Destruction
(Normal Trap)
Destroys 1 opponent's face-up monster on the field with less ATK than their Life Points and deals that monster's ATK to both players' Life Points.

More info: https://yugipedia.com/wiki/Ring_of_Destruction
Turn 14: Yami Bakura
Ectoplasmer
(Continuous Spell)
Forces each player to Tribute 1 monster at their End Phase and deal half its original ATK to their opponent's Life Points.
More info: https://yugipedia.com/wiki/Ectoplasmer
The Spirit of the Millennium Ring Returns (Part 1)
Turn 14: Seto Kaiba
Des Feral Imp
DARK / Effect Monster / Level 4 / ATK 1600 / DEF 1800
(Reptile / Flip / Effect)
FLIP: Shuffles 1 card in your Grave into your Deck.

More info: https://yugipedia.com/wiki/Des_Feral_Imp
Turn 15: Yami Marik
Rope of Life
(Normal Trap)
Revives 1 monster from your Grave to your field with 800 more ATK by discarding all cards in your hand (min 1).

More info: https://yugipedia.com/wiki/Rope_of_Life
 
Turn 1: Yami Bakura
The Earl of Demise
DARK / Normal Monster / Level 5 / ATK 2000 / DEF 700
(Fiend / Normal)
This gentlemanly creature is extremely wicked, feared by man and fiend alike.

More info: https://yugipedia.com/wiki/The_Earl_of_Demise
Turn 2: Yami Marik
Helpoemer
DARK / Effect Monster / Level 5 / ATK 2000 / DEF 1400
(Fiend / Effect)
1. Cannot be revived. 2. Randomly discards 1 card from the opponent's hand after their Battle Phase while in your Grave after being destroyed in battle.
More info: https://yugipedia.com/wiki/Helpoemer
Turn 3: Yami Bakura
Destiny Board
(Continuous Trap)
1. You win the Duel when this card and all 4 "Spirit Message" cards are in your Spell and Trap Card Zones in the proper order. 2. Places the next "Spirit Message" card from your hand or Deck to your field at the opponent's End Phases. 3. Destroys all "Destiny Board" and "Spirit Message" cards on your field when any of them leave the field.
More info: https://yugipedia.com/wiki/Destiny_Board
Turn 4: Yami Marik
Drillago
DARK / Effect Monster / Level 4 / ATK 1600 / DEF 1100
(Machine / Effect)
Can attack the opponent directly if they only control face-up monsters with at least 1600 ATK.

More info: https://yugipedia.com/wiki/Drillago
Turn 5: Yami Bakura
Spirit Message "N"
(Continuous Spell)
Only placed on the field using the effect of "Destiny Board".
More info: https://yugipedia.com/wiki/Spirit_Message_%22N%22
The Wrath of Marik and The Winged Dragon of Ra (Part 1)
Turn 1: Yami Marik
Granadora
WATER / Effect Monster / Level 4 / ATK 1900 / DEF 700
(Reptile / Effect)
Gives you 1000 Life Points when Summoned to your field, but deals you 2000 damage when destroyed and sent to your Grave.

More info: https://yugipedia.com/wiki/Granadora
Turn 2: Seto Kaiba
XYZ-Dragon Cannon
LIGHT / Fusion Monster / Level 8 / ATK 2800 / DEF 2600
(Machine / Fusion / Effect)
"X-Head Cannon" + "Y-Dragon Head" + "Z-Metal Tank"
1. First Special Summoned from your Extra Deck by banishing the above monsters on your field without "Polymerization". 2. Cannot be revived. 3. Can destroy 1 card on the opponent's field by discarding 1 card.
More info: https://yugipedia.com/wiki/XYZ-Dragon_Cannon
Turn 3: Yami Marik
Newdoria
DARK / Effect Monster / Level 4 / ATK 1200 / DEF 800
(Fiend / Effect)
Destroys 1 monster on the field if destroyed in battle and sent to your Grave.

More info: https://yugipedia.com/wiki/Newdoria
Turn 4: Seto Kaiba
Tribute to the Doomed
(Normal Spell)
Destroys 1 monster on the field by discarding 1 card.
More info: https://yugipedia.com/wiki/Tribute_to_The_Doomed
Turn 5: Yami Marik
Lava Golem
FIRE / Effect Monster / Level 8 / ATK 3000 / DEF 2500
(Fiend / Effect)
1. First Special Summoned from your hand to the opponent's field by Tributing 2 of their monsters, but prevents your Normal Summon or Set that turn.
2.
Deals the controller 1000 damage at their Standby Phases.
More info: https://yugipedia.com/wiki/Lava_Golem
Turn 6: Seto Kaiba
Interdimensional Matter Transporter
(Normal Trap)
Banishes 1 face-up monster on your field until the End Phase.

More info: https://yugipedia.com/wiki/Interdimensional_Matter_Transporter
Turn 7: Yami Marik
Masked Beast Des Gardius
DARK / Effect Monster / Level 8 / ATK 3300 / DEF 2500
(Fiend / Effect)
1. First Special Summoned by Tributing 2 monsters, including "Grand Tiki Elder" or "Melchid the Four-Face Beast". 2. Equips "The Mask of Remnants" to 1 monster on the opponent's field when sent from your field to your Grave.
More info: https://yugipedia.com/wiki/Masked_Beast_Des_Gardius
Turn 8: Seto Kaiba
X-Head Cannon
LIGHT / Normal Monster / Level 4 / ATK 1800 / DEF 1500
(Machine / Normal)
A monster with a mighty cannon barrel, it is able to integrate its attacks. It attacks in many ways by combining and separating with other monsters.

More info: https://yugipedia.com/wiki/X-Head_Cannon
Turn 9: Yami Marik
Makyura the Destructor
DARK / Effect Monster / Level 4 / ATK 1600 / DEF 1200
(Warrior / Effect)
Lets you activate 1 Trap Card from your hand when sent from the Monster Card Zone to your Grave, but only once per turn.

More info: https://yugipedia.com/wiki/Makyura_the_Destructor
Turn 10: Seto Kaiba
Dark Hole
(Normal Spell)
Destroys all monsters on the field.
More info: https://yugipedia.com/wiki/Dark_Hole
Turn 11: Yami Marik
Barrel Behind the Door
(Counter Trap)
Shifts effect damage aimed at your Life Points back to your opponent's Life Points instead.

More info: https://yugipedia.com/wiki/Barrel_Behind_the_Door
Turn 12: Seto Kaiba
Man-Eater Bug
EARTH / Effect Monster / Level 2 / ATK 450 / DEF 600
(Insect / Flip / Effect)
FLIP: Destroys 1 monster on the field.

More info: https://yugipedia.com/wiki/Man-Eater_Bug
Turn 13: Yami Marik
The Winged Dragon of Ra
DIVINE / God Card / Level 10 / ATK ? / DEF ?
(Divine-Beast)
Spirits sing of a powerful creature that rules over all that is mystic.

More info:
https://yugipedia.com/wiki/The_Winged_Dragon_of_Ra_(original
)
Odeon’s Traps (Part 2)
Turn 20: Seto Kaiba
Blue-Eyes Ultimate Dragon
LIGHT / Fusion Monster / Level 12 / ATK 4500 / DEF 3800
(Dragon / Fusion)
"Blue-Eyes White Dragon" + "Blue-Eyes White Dragon" + "Blue-Eyes White Dragon"

More info:
https://yugipedia.com/wiki/Blue-Eyes_Ultimate_Dragon
Turn 21: Odeon Ishtar
Magic Jammer
(Counter Trap)
Negates and destroys an activated Spell Card by discarding 1 card.

More info: https://yugipedia.com/wiki/Magic_Jammer
Turn 22: Seto Kaiba
Versago the Destroyer
DARK / Effect Monster / Level 3 / ATK 1100 / DEF 900
(Fiend / Effect)
Can substitute for 1 Fusion Material in a Fusion Summon, but the others must be correct.

More info: https://yugipedia.com/wiki/Versago_the_Destroyer
Turn 23: Odeon Ishtar
Negate Attack
(Counter Trap)
Blocks an attack from an opponent's monster and ends the Battle Phase.

More info: https://yugipedia.com/wiki/Negate_Attack
Turn 24: Seto Kaiba
Monster Reborn
(Normal Spell)
Revives 1 monster from either Grave to your field.
More info: https://yugipedia.com/wiki/Monster_Reborn
Turn 25: Odeon Ishtar
Embodiment of Apophis
(Continuous Trap)
Becomes a Level 4 EARTH Reptile Normal Monster with 1600 ATK and 1800 DEF on your field, but is still a Trap Card.
More info: https://yugipedia.com/wiki/Embodiment_of_Apophis
Turn 26: Seto Kaiba
Cyber Jar
DARK / Effect Monster / Level 3 / ATK 900 / DEF 900
(Rock / Flip / Effect)
1. FLIP: Destroys all monsters on the field. 2. Both players reveal their Deck's next 5 cards and Special Summon any revealed Level 4 or lower monsters on their field face-up in Attack Mode or face-down in Defense Mode, but keep the others in their hands.
More info: https://yugipedia.com/wiki/Cyber_Jar
Turn 27: Odeon Ishtar
Embodiment of Apophis
(Continuous Trap)
Becomes a Level 4 EARTH Reptile Normal Monster with 1600 ATK and 1800 DEF on your field, but is still a Trap Card.

More info: https://yugipedia.com/wiki/Embodiment_of_Apophis
Turn 28: Odeon Ishtar
Vorse Raider
DARK / Normal Monster / Level 4 / ATK 1900 / DEF 1200
(Beast-Warrior / Normal)
This wicked Beast-Warrior does every horrid thing imaginable, and loves it! His axe bears the marks of his countless victims.

More info:
https://yugipedia.com/wiki/Vorse_Raider
Turn 29: Seto Kaiba
Spear Dragon
WIND / Effect Monster / Level 4 / ATK 1900 / DEF 0
(Dragon / Effect)
Deals piercing damage to the opponent if attacking a Defense Position monster, but changes to Defense Mode after the Damage Step after attacking.

More info: https://yugipedia.com/wiki/Spear_Dragon
Turn 30: Odeon Ishtar
Goblin Attack Force
EARTH / Effect Monster / Level 4 / ATK 2300 / DEF 0
(Warrior / Effect)
Changes to Defense Mode after attacking and cannot change its battle position unti lyour next End Phase.

More info: https://yugipedia.com/wiki/Goblin_Attack_Force
Turn 31: Seto Kaiba
White Dragon Ritual
(Ritual Spell)
Ritual Summons "Paladin of White Dragon" by Tributing monsters from your hand or field whose Levels total 4 or more.
More info: https://yugipedia.com/wiki/White_Dragon_Ritual
Odeon’s Traps (Part 1)
Turn 8: Seto Kaiba
Obelisk the Tormentor
DIVINE / God Card / Level 10 / ATK 4000 / DEF 4000
(Divine-Beast)
The descent of this mighty creature shall be heralded by burning winds and twisted land. And with the coming of this horror, those who draw breath shall know the true meaning of eternal slumber.

More info: https://yugipedia.com/wiki/Obelisk_the_Tormentor_(original)
Turn 9: Odeon Ishtar
Vorse Raider
DARK / Normal Monster / Level 4 / ATK 1900 / DEF 1200
(Beast-Warrior / Normal)
This wicked Beast-Warrior does every horrid thing imaginable, and loves it! His axe bears the marks of his countless victims.

More info:
https://yugipedia.com/wiki/Vorse_Raider
Turn 10: Seto Kaiba
Kaiser Glider
LIGHT / Effect Monster / Level 6 / ATK 2400 / DEF 2200
(Dragon / Effect)
1. Is not destroyed in battle by a monster with the same ATK. 2. Returns 1 monster on the field to the owner's hand when destroyed and to your Grave.
More info: https://yugipedia.com/wiki/Kaiser_Glider
Turn 11: Odeon Ishtar
Mirror Force
(Normal Trap)
Destroys the opponent's Attack Position monsters when an opponent's monster attacks.

More info: https://yugipedia.com/wiki/Mirror_Force
Turn 12: Seto Kaiba
Pot of Greed
(Normal Spell)
You draw 2 cards.
More info: https://yugipedia.com/wiki/Pot_of_Greed
Turn 13: Odeon Ishtar
Magic Cylinder
(Normal Trap)
Blocks an attack from an opponent's monster and the opponent takes damage equal to their monster's ATK.

More info: https://yugipedia.com/wiki/Magic_Cylinder
Turn 14: Seto Kaiba
A Wingbeat of Giant Dragon
(Normal Spell)
Destroys all Spell and Trap Cards on the field by returning 1 Level 5 or higher Dragon from your field to the owner's hand.
More info: https://yugipedia.com/wiki/A_Wingbeat_of_Giant_Dragon
Turn 15: Odeon Ishtar
Goblin Attack Force
EARTH / Effect Monster / Level 4 / ATK 2300 / DEF 0
(Warrior / Effect)
Changes to Defense Mode after attacking and cannot change its battle position until the player's next End Phase.

More info: https://yugipedia.com/wiki/Goblin_Attack_Force
Turn 16: Seto Kaiba
Gadget Soldier
FIRE / Normal Monster / Level 6 / ATK 1800 / DEF 2000
(Machine / Normal)
A rust-free machine warrior born to battle.

More info: https://yugipedia.com/wiki/Gadget_Soldier
Turn 17: Odeon Ishtar
Heavy Storm
(Normal Spell)
Destroys all Spell and Trap Cards on the field.
More info: https://yugipedia.com/wiki/Heavy_Storm
Turn 18: Seto Kaiba
Paladin of White Dragon
LIGHT / Ritual Monster / Level 4 / ATK 1900 / DEF 1200
(Dragon / Ritual / Effect)
1. Can be Ritual Summoned with "White Dragon Ritual". 2. Destroys any Set monster it attacks when the Damage Step starts. 3. Can Special Summon 1 "Blue-Eyes White Dragon" from your hand or Deck to your field by Tributing itself, but prevents it from attacking that turn.
More info: https://yugipedia.com/wiki/Paladin_of_White_Dragon
Turn 19: Odeon Ishtar
Trap
Jammer
(Counter Trap)
Negates and destroys an activated Trap Card during the Battle Phase.

More info: https://yugipedia.com/wiki/Trap_Jammer
Kaiba’s Fate (Part 2)
Turn 1: Odeon Ishtar
Magic Jammer
(Counter Trap)
Negates and destroys an activated Spell Card by discarding 1 card.

More info: https://yugipedia.com/wiki/Magic_Jammer
Turn 2: Seto Kaiba
Slate Warrior
WIND / Effect Monster / Level 4 / ATK 1900 / DEF 400
(Fiend / Flip / Effect)
FLIP: Gains 500 ATK and DEF.
Lowers the ATK and DEF of the monster that destroys it in battle by 500.

More info: https://yugipedia.com/wiki/Slate_Warrior
Turn 3: Odeon Ishtar
Summoned Skull
DARK / Normal Monster / Level 6 / ATK 2500 / DEF 1200
(Fiend / Normal)
A fiend with dark powers for confusing the enemy. Among the Fiend-Type monsters, this monster boasts considerable force.


(Always an "Archfiend" card.)

More info: https://yugipedia.com/wiki/Summoned_Skull
Turn 4: Seto Kaiba
Blue-Eyes Shining Dragon
LIGHT / Effect Monster / Level 10 / ATK 3000 / DEF 2500
(Dragon / Effect)
1. Only Special Summoned by Tributing 1 "Blue-Eyes Ultimate Dragon". 2. Gains 300 ATK for each Dragon in your Grave. 3. Can negate and destroy activated card effects that target it.
More info: https://yugipedia.com/wiki/Blue-Eyes_Shining_Dragon
Turn 5: Odeon Ishtar
Torrential Tribute
(Normal Trap)
Destroys all monsters on the field when a monster(s) is Summoned.

More info: https://yugipedia.com/wiki/Torrential_Tribute
Turn 6: Seto Kaiba
Kaibaman
LIGHT / Effect Monster / Level 3 / ATK 200 / DEF 700
(Warrior / Effect)
Can Special Summon 1 "Blue-Eyes White Dragon" from your hand to your field by Tributing itself.

More info: https://yugipedia.com/wiki/Kaibaman
Turn 7: Odeon Ishtar
Seven Tools of the Bandit
(Counter Trap)
Negates and destroys an activated Trap Card by paying 1000 Life Points.

More info: https://yugipedia.com/wiki/Seven_Tools_of_the_Bandit
Kaiba’s Fate (Part 1)
Turn 3: Seto Kaiba
Deck Devastation Virus
(Normal Trap)
Destroys all monsters in the opponent's hand, field and cards they draw with 1500 or less ATK for 3 of their turns by Tributing 1 monster with 2000 or more ATK.

More info: https://yugipedia.com/wiki/Deck_Devastation_Virus
Turn 4: Ishizu Ishtar
Agido

EARTH / Effect Monster / Level 4 / ATK 1500 / DEF 1300
(Fairy / Effect)
1. You roll a die when it destroyed in battle and sent to your Grave. 2. Revives 1 Fairy monster from your Grave to your field equal to the die result or a Level 6 or higher monster if the result is 6.
More info: https://yugipedia.com/wiki/Agido
Turn 5: Seto Kaiba
Soul Exchange
(Normal Spell)
Tributes 1 monster on the opponent's field instead of 1 on your field, but prevents your Battle Phase that turn.
More info: https://yugipedia.com/wiki/Soul_Exchange
Turn 6: Ishizu Ishtar
Raigeki
(Normal Spell)
Destroys all the opponent's monsters on the field.
More info: https://yugipedia.com/wiki/Raigeki
Turn 7: Seto Kaiba
Slate Warrior
WIND / Effect Monster / Level 4 / ATK 1900 / DEF 400
(Fiend / Flip / Effect)
FLIP: Gains 500 ATK and DEF.
Lowers the ATK and DEF of the monster that destroys it in battle by 500.

More info: https://yugipedia.com/wiki/Slate_Warrior
Turn 8: Ishizu Ishtar
Wingweaver
LIGHT / Normal Monster / Level 7 / ATK 2750 / DEF 2400
(Fairy / Normal)
A six-winged fairy who prays for peace and hope.

More info: https://yugipedia.com/wiki/Wingweaver
Turn 9: Seto Kaiba
Enraged Battle Ox
EARTH / Effect Monster / Level 4 / ATK 1700 / DEF 1000
(Beast-Warrior / Effect)
Gives Beast, Beast-Warrior and Winged Beast monsters on your field piercing battle damage to the opponent when attacking Defense Position monsters.

More info: https://yugipedia.com/wiki/Enraged_Battle_Ox
Turn 10: Ishizu Ishtar
Monster Reborn
(Normal Spell)
Revives 1 monster from either Grave to your field.
More info: https://yugipedia.com/wiki/Monster_Reborn
Turn 10: Ishizu Ishtar
Wingweaver
LIGHT / Normal Monster / Level 7 / ATK 2750 / DEF 2400
(Fairy / Normal)
A six-winged fairy who prays for peace and hope.

More info: https://yugipedia.com/wiki/Wingweaver
Turn 11: Seto Kaiba
Spear Dragon
WIND / Effect Monster / Level 4 / ATK 1900 / DEF 0
(Dragon / Effect)
Deals piercing damage to the opponent if attacking a Defense Position monster, but changes to Defense Mode after the Damage Step after attacking.

More info: https://yugipedia.com/wiki/Spear_Dragon
Turn 12: Ishizu Ishtar
Zolga

EARTH / Effect Monster / Level 4 / ATK 1700 / DEF 1200
(Fairy / Effect)
Gives you 2000 Life Points when you use it for a Tribute Summon.

More info: https://yugipedia.com/wiki/Zolga
Turn 13: Seto Kaiba
Ring of Destruction
(Normal Trap)
Destroys 1 face-up monster on the opponent's field with less ATK than their Life Points and deals that monster's ATK to both players Life Points.

More info: https://yugipedia.com/wiki/Ring_of_Destruction
Turn 14: Ishizu Ishtar
Blast Held by a Tribute
(Normal Trap)
Destroys the opponent's Attack Position monsters and deals them 1000 damage when their Tribute Summoned monster attacks.

More info: https://yugipedia.com/wiki/Blast_Held_by_a_Tribute
Turn 15: Seto Kaiba
Vorse Raider
DARK / Normal Monster / Level 4 / ATK 1900 / DEF 1200
(Beast-Warrior / Normal)
This wicked Beast-Warrior does every horrid thing imaginable, and loves it! His axe bears the marks of his countless victims.

More info:
https://yugipedia.com/wiki/Vorse_Raider
Rex’s Dinos vs. Mai’s Harpie’s  (Part 2)
Turn 20: Mai Valentine
Graceful Charity
(Normal Spell)
You draw 3 cards, then discards 2 cards.
More info: https://yugipedia.com/wiki/Graceful_Charity
Turn 21: Rex Raptor
Gilasaurus

EARTH / Effect Monster / Level 3 / ATK 1400 / DEF 400
(Dinosaur / Effect)
Can be Special Summoned from your hand to your field, but the opponent can revive 1 monster from their Grave to their field.

More info: https://yugipedia.com/wiki/Gilasaurus
Turn 22: Mai Valentine
Dark Hole
(Normal Spell)
Destroys all monsters on the field.
More info: https://yugipedia.com/wiki/Dark_Hole
Turn 23: Rex Raptor
Negate Attack
(Counter Trap)
Blocks an attack from an opponent's monster and ends the Battle Phase.

More info: https://yugipedia.com/wiki/Negate_Attack
Turn 24: Mai Valentine
Amazoness Archer

EARTH / Effect Monster / Level 4 / ATK 1400 / DEF 1200
(Warrior / Effect)
Can deal the opponent 1200 damage by Tributing 2 monsters.

More info: https://yugipedia.com/wiki/Amazoness_Archer
 
Turn 1: Seto Kaiba
Obelisk the Tormentor
DIVINE / God Card / Level 10 / ATK 4000 / DEF 4000
(Divine-Beast)
The descent of this mighty creature shall be heralded by burning winds and twisted land. And with the coming of this horror, those who draw breath shall know the true meaning of eternal slumber.

More info: https://yugipedia.com/wiki/Obelisk_the_Tormentor_(original)
Turn 2: Ishizu Ishtar
Exchange of the Spirit
(Normal Trap)
Swaps the cards in both players' Decks with the ones in their Grave by paying 1000 Life Points when both players have 15 or more cards in their Grave, but only once per Duel.

More info: https://yugipedia.com/wiki/Exchange_of_the_Spirit