*Cards below had their rarities changed to one that I feel better matches the card's effect based on my views of the cards.
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Invasion of Chaos Rarity Changes (Page 1)

IOC-056
Giga Gagagigo
WATER / Reptile / Level 5 / ATK 2450 / DEF 1500
In order to fight tremendous evil, he gained formidable power through body reconstruction, but lost his heart and his redemption.
SUPER RARE
IOC-054
Dark Mirror Force
Normal Trap
You can only activate this card when your opponent's monster declares an attack. Remove all monsters in Defense Position on your opponent's side of the field from play.
SUPER RARE
IOC-049
Cursed Seal of the Forbidden Spell
Counter Trap
Discard 1 Spell Card from your hand to negate the activation and the effect of a Spell Card and destroy it. Your opponent cannot activate Spell Cards of the same name (including the Spell Card that is destroyed by this card's effect) during the rest of this Duel.
SUPER RARE
IOC-047
Big Burn
Normal Trap
You can only activate this card when your opponent activates a card that specifically designates a monster in the Graveyard as a target. Remove all monsters in both players' Graveyards from play.
COMMON
IOC-037
Yellow Luster Shield
Continuous Spell
Increase the DEF of all monsters on your side of the field by 300 points.
SUPER RARE
IOC-034
Ojama Delta Hurricane!!
Normal Spell
You can only activate this card when "Ojama Green", "Ojama Yellow", and "Ojama Black" are face-up on your side of the field. Destroy all cards on your opponent's side of the field.
COMMON
IOC-033
Wild Nature's Release
Normal Spell
Increase the ATK of 1 face-up Beast-Type or Beast-Warrior-Type Monster on the field by an amount equal to its DEF. Destroy the monster during the End Phase.
RARE
IOC-032
Heart of the Underdog
Continuous Spell
During your Draw Phase, if the card you draw is a Normal Monster Card, you can draw 1 more card by showing the card to your opponent.
SUPER RARE
IOC-030
Granadora
WATER / Reptile / Level 4 / ATK 1900 / DEF 700
When this monster is Normal Summoned, Flip Summoned or Special Summoned successfully, increase your Life Points by 1000 points. When this card is destroyed and sent to the Graveyard, you take 2000 points of damage.
SUPER RARE
IOC-029
Bowganian
DARK / Machine / Level 3 / ATK 1300 / DEF 1000
During each of your Standby Phases, inflict 600 points of damage to your opponent's Life Points.
SUPER RARE
IOC-026
Drillago
DARK / Machine / Level 4 / ATK 1600 / DEF 1100
When there are only face-up monsters with ATK 1600 or more on your opponent's side of the field, this monster can attack your opponent's Life Points directly.
SUPER RARE
IOC-019
Inferno
FIRE / Pyro / Level 4 / ATK 1100 / DEF 1900
This card can only be Special Summoned by removing 1 FIRE monster in your Graveyard from play. When this card destroys an opponent's monster and sends it to the Graveyard as a result of battle, inflict 1500 points of damage to your opponent's Life Points.
SUPER RARE
IOC-018
Chaosrider Gustaph
WIND / Warrior / Level 4 / ATK 1400 / DEF 1500
You can remove up to 2 Spell Cards in your Graveyard from play to increase the ATK of this monster by 300 points for each card removed from play until the end of your opponent's next turn. This effect can only be used once during your turn.
COMMON
IOC-017
Chaos Necromancer
DARK / Fiend / Level 1 / ATK 0 / DEF 0
The ATK of this card becomes the number of Monster Cards in your Graveyard x 300 points.
SUPER RARE
IOC-014
Freed the Brave Wanderer
LIGHT / Warrior / Level 4 / ATK 1700 / DEF 1200
Remove 2 LIGHT monsters in your Graveyard from play to destroy 1 face-up monster on the field with higher ATK than this card. You can only use this effect once per turn.
RARE
IOC-012
D. D. Scout Plane
DARK / Machine / Level 2 / ATK 800 / DEF 1200
If this card is removed from play, Special Summon this card in face-up Attack Position on your side of the field during the End Phase of this turn.
RARE
IOC-007
Strike Ninja
DARK / Warrior / Level 4 / ATK 1700 / DEF 1200
You can remove this card from play until the End Phase of this turn by removing 2 DARK monsters in your Graveyard from play. You can use this effect during either player's turn. You can only use this effect once per turn.
COMMON
IOC-003
Soul Tiger
EARTH / Beast / Level 4 / ATK 0 / DEF 2100
The soul of a tiger that is said to devour human souls. He is a famous soul that you wouldn't want to run into in a dark alley.
SUPER RARE
IOC-000
Chaos Emperor Dragon - Envoy of the End
DARK / Dragon / Level 8 / ATK 3000 / DEF 2500
This card can only be Special Summoned by removing 1 LIGHT and 1 DARK monster in your Graveyard from play. Pay 1000 of your Life Points to send all cards in both players' hands and on the field to the Graveyard. Inflict 300 points of damage to your opponent's Life Points for each card that is sent to the Graveyard by this effect.
ULTRA RARE