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Structure Deck Card Ratings (Page 1)

1. Only new cards and those with updated text that changes how they work are included below.
2.
Products below have their name shortened for more space.
3.
 SDMA-EN info:  https://yugipedia.com/wiki/Structure_Deck:_Marik_(TCG)
4. SDWS-EN info: https://yugipedia.com/wiki/Warriors'_Strike_Structure_Deck 
5. SDMM-EN info:  https://yugipedia.com/wiki/Machina_Mayhem_Structure_Deck
6. SDGU-EN info:  https://yugipedia.com/wiki/Gates_of_the_Underworld_Structure_Deck
Gates of the Underworld (SDGU-EN031)
Dark Scheme
TRAP / Normal Trap
Your opponent can discard 1 card to negate this card's effect, otherwise both players discard 2 cards, then draw 2 cards.
(Common)
Rating: 1 out of 5
Pretty confident anyone will choose to negate the effect.
Gates of the Underworld (SDGU-EN023)
The Gates of Dark World
SPELL / Field Spell
All Fiend-Type monsters gain 300 ATK and DEF. Once per turn: You can banish 1 Fiend-Type monster from your Graveyard; discard 1 Fiend-Type monster, then draw 1 card.
(Common)
Rating: 1 out of 5
Everyone is locked inside, which explains why the Deck (#20) is so poor.
Gates of the Underworld (SDGU-EN003)
Ceruli, Guru of Dark World
DARK / Effect Monster / Level 1 / ATK 100 / DEF 300
(Fiend / Effect)

If this card is discarded to the Graveyard by a card effect: Special Summon this card from the Graveyard to your opponent's side of the field in face-up Defense Position. When this card is Special Summoned by the effect of a "Dark World" card: Your opponent must discard 1 card.
(Super Rare)
Rating: 1 out of 5
Giving it to your opponent leaves them a prime opportunity to bring out something stronger.
Gates of the Underworld (SDGU-EN002)
Snoww
, Unlight of Dark World
DARK / Effect Monster / Level 4 / ATK 1700 / DEF 0
(Fiend / Effect)

If this card is discarded to the Graveyard by a card effect: If it was discarded from your hand to your Graveyard by an opponent's card effect, you can target 1 monster in your opponent's Graveyard; add 1 "Dark World" card from your Deck to your hand, then Special Summon that target (if any) in face-up Defense Position.
(Super Rare)
Rating: 1 out of 5
Blinds the others so they can't even attack or see their opposition.
Gates of the Underworld (SDGU-EN001)
Grapha
, Dragon Lord of Dark World
DARK / Effect Monster / Level 8 / ATK 2700 / DEF 1800
(Fiend / Effect)

You can Special Summon this card (from your Graveyard) by returning 1 face-up "Dark World" monster you control to the hand, except "Grapha, Dragon Lord of Dark World". If this card is discarded to the Graveyard by a card effect: Target 1 card your opponent controls; destroy that target, then, if this card was discarded from your hand to your Graveyard by an opponent's card effect, look at 1 random card in your opponent's hand, then, if it was a monster, you can Special Summon it to your side of the field.
(Ultra Rare)
Rating: 1 out of 5
The Deck's boss monster is proving barely stronger than the others. (#21)
 
Machina Mayhem (SDMM-EN021)
Machina Armored Unit
SPELL / Continuous Spell
Once per turn, when a Machine-Type monster is destroyed by battle and sent to your Graveyard, you can Special Summon 1 Machine-Type monster from your Deck that has the same Attribute and less ATK than the destroyed monster.
(Common)
Rating: 2 out of 5
The weaker the monster, the less it likely has to offer, but that's better than nothing.
Machina Mayhem (SDMM-EN020)
The Big Saturn
DARK / Effect Monster / Level 8 / ATK 2800 / DEF 2200
(Machine / Effect)

This card cannot be Special Summoned from the hand or Deck. Once per turn, during your Main Phase, you can discard 1 card and pay 1000 Life Points to have this card gain 1000 ATK until the End Phase. When this card is destroyed and sent to the Graveyard by an opponent's card effect, both players take damage equal to this card's ATK..
(Common)
Rating: 1 out of 5
An unnecessary restriction for two payments and a temporary ATK boost. The last effect is even worse.
Machina Mayhem (SDMM-EN009)
Machina Force
EARTH / Effect Monster / Level 10 / ATK 4600 / DEF 4100
(Machine / Effect)

This card cannot be Normal Summoned or Set. This card cannot be Special Summoned except with "Commander Covington". This card cannot declare an attack unless you pay 1000 Life Points. You can send this card from the field to the Graveyard to select and Special Summon one each of "Machina Soldier", "Machina Sniper", and "Machina Defender" from your Graveyard.
(Common)
Rating: 1 out of 5
It's as if Dark Elf became the world's costliest hunk of scrap metal.
Machina Mayhem (SDMM-EN008)
Machina Defender
EARTH / Effect Monster / Level 4 / ATK 1200 / DEF 1800
(Machine / Flip / Effect)

FLIP: Add 1 "Commander Covington" from your Deck to your hand.
(Common)
Rating: 2 out of 5
1800 DEF is an okay defense, but nothing is achieved by getting the commander.
Machina Mayhem (SDMM-EN007)
Machina Sniper
EARTH / Effect Monster / Level 4 / ATK 1800 / DEF 800
(Machine / Effect)

"Machina" monsters cannot be attacked, except "Machina Sniper".
(Common)
Rating: 3 out of 5
One sharp-shooter and attacker, compared to the others.
Machina Mayhem (SDMM-EN006)
Machina Soldier
EARTH / Effect Monster / Level 4 / ATK 1600 / DEF 1500
(Machine / Effect)

When this card is Normal Summoned while you control no monsters, you can Special Summon 1 "Machina" monster from your hand, except "Machina Soldier".
(Common)
Rating: 1 out of 5
The effect essentially makes it a vanila monster.
Machina Mayhem (SDMM-EN005)
Commander Covington
EARTH / Effect Monster / Level 4 / ATK 1000 / DEF 600
(Machine / Effect)

You can send one face-up "Machina Soldier", "Machina Sniper", and "Machina Defender" you control to the Graveyard to Special Summon 1 "Machina Force" from your hand or your Deck.
(Common)
Rating: 1 out of 5
Something this weak should be cleaning the inside of horse stables.
Machina Mayhem (SDMM-EN003)
Machina Peacekeeper
EARTH / Effect Monster / Level 2 / ATK 500 / DEF 400
(Machine / Union / Effect)

When this card on the field is destroyed and sent to the Graveyard, you can add 1 Union Monster from your Deck to your hand. Once per turn, during your Main Phase, you can equip this card to a Machine-Type monster you control as an Equip Card, OR unequip it to Special Summon this card in face-up Attack Position. (A monster can only be equipped with 1 Union Monster at a time. If the equipped monster would be destroyed, destroy this card instead.)
(Super Rare)
Rating: 2 out of 5
Gearframe is pretty good, but this isn't all that useful as an Equip Card.
Machina Mayhem (SDMM-EN002)
Machina Gearframe
EARTH / Effect Monster / Level 4 / ATK 1800 / DEF 0
(Machine / Union / Effect)

When this card is Normal Summoned, you can add 1 "Machina" monster, except "Machina Gearframe", from your Deck to your hand. Once per turn, during your Main Phase, you can equip this card to a Machine-Type monster you control as an Equip Card, OR unequip it to Special Summon this card in face-up Attack Position. (A monster can only be equipped with 1 Union Monster at a time. If the equipped monster would be destroyed, destroy this card instead.)
(Super Rare)
Rating: 3 out of 5
Instant access to Fortress and has high ATK, but that DEF prevents a higher rating.
Machina Mayhem (SDMM-EN001)
Machina Fortress
EARTH / Effect Monster / Level 7 / ATK 2500 / DEF 1600
(Machine / Effect)

You can discard Machine-Type monster(s) whose total Levels equal 8 or more to Special Summon this card from your hand or Graveyard. When this card is destroyed by battle and sent to the Graveyard, select and destroy 1 card your opponent controls. When this face-up card you control is targeted by an opponent's Effect Monster's effect, look at your opponent's hand and discard 1 card from their hand.
(Ultra Rare)
Rating: 3 out of 5
Can even discard itself, then bring itself out. Could be stronger for its Level though.
 
Warriors' Strike (SDWS-EN004)
Gemini Soldier
WIND / Effect Monster / Level 2 / ATK 500 / DEF 300
(Warrior / Gemini / Effect)

This card is treated as a Normal Monster while face-up on the field or in the Graveyard. While this card is face-up on the field, you can Normal Summon it to have it be treated as an Effect Monster with this effect:
● Once per turn, if this card would be destroyed by battle, it is not destroyed. If this card battles, after damage calculation, you can Special Summon 1 Level 4 or lower Gemini monster from your Deck, except "Gemini Soldier".
(Common)
Rating: 2 out of 5
Searchable and can survivve 1 battle, but you probably won't get the effect off more than once per Duel.
Warriors' Strike (SDWS-EN003)
Featherizer
WIND / Effect Monster / Level 2 / ATK 700 / DEF 1100
(Spellcaster / Effect)

When this card is destroyed by battle and sent to the Graveyard, you can send 1 Gemini monster from your Deck to the Graveyard and draw 1 card.
(Super Rare)
Rating: 1 out of 5
Doesn't do anything to really support the Deck's strategy at all.
Warriors' Strike (SDWS-EN002)
Evocator Chevalier

FIRE / Effect Monster / Level 4 / ATK 1900 / DEF 900
(Warrior / Gemini / Effect)

This card is treated as a Normal Monster while face-up on the field or in the Graveyard. While this card is face-up on the field, you can Normal Summon it to have it be treated as an Effect Monster with this effect:
● You can send 1 face-up Equip Card you control to the Graveyard to destroy 1 card your opponent controls.
(Super Rare)
Rating: 3 out of 5
This is what you need for a Gemini Deck, a strong, low-Level monster with a good effect.
Warriors' Strike (SDWS-EN001)
Phoenix Gearfried

FIRE / Effect Monster / Level 8 / ATK 2800 / DEF 2200
(Warrior / Gemini / Effect)

This card is treated as a Normal Monster while face-up on the field or in the Graveyard. While this card is face-up on the field, you can Normal Summon it to have it be treated as an Effect Monster with this effect:
● When your opponent activates a Spell Card, you can select 1 Gemini monster from your Graveyard and Special Summon it. Also, you can send 1 face-up Equip Card you control to the Graveyard to negate the activation of a Spell or Trap Card that targets a monster on the field, and destroy it.
(Ultra Rare)
Rating: 3 out of 5
Updated from Gearfried the Swordmaster (#22) and quite a bit better.
 
Marik (TCG) (SDMA-EN038)
Temple of the Kings
SPELL / Continuous Spell
The controller of this card can activate Trap Cards the same turn they are Set. If you control "Mystical Beast of Serket" and this card, you can send both to the Graveyard to Special Summon 1 monster from your hand, Deck or Extra Deck.
(Ultra Rare)
Rating: 1 out of 5
Would've been a great selling point if it weren't banned.
Marik (TCG) (SDMA-EN037)
Mystical Beast of Serket
EARTH / Effect Monster / Level 6 / ATK 2500 / DEF 2000
(Fairy / Effect)

Destroy this card if you do not control "Temple of the Kings". Each time this card destroys a monster by battle, the destroyed monster is removed from play, and this card gains 500 ATK.
(Ultra Rare)
Rating: 1 out of 5
Totally unusable outside casual Duels thanks to the banning of the next card.