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Castle of Dark Illusions
FLIP: All Zombie-Type monsters gain 200 ATK and DEF. During each of your next 4 Standby Phases, each of those Zombie-Type monsters gains 200 more ATK and DEF. These effects last as long as this card is face-up on the field.

Castle Walls
Increase the DEF of 1 face-up monster on the field by 500 points until the end of this turn.

Catapult Turtle
Once per turn: You can Tribute 1 monster; inflict damage to your opponent equal to half the Tributed monster's ATK on the field.

Catnipped Kitty
This card cannot be attacked if there is another Beast-Type monster on your side of the field. Once per turn, you can make the DEF of 1 monster on your opponent's side of the field 0 until the end of this turn.

Cat's Ear Tribe
The original ATK of your opponent's monster(s) that battles with this card during his/her turn becomes 200 points during the Damage Step.

Cave Dragon
Cannot be Normal Summoned while you control a monster. This card cannot declare an attack unless you control another Dragon-Type monster.

Ceasefire
If a face-down Defense Position monster or an Effect Monster is on the field: Change all face-down Defense Position monsters on the field to face-up Defense Position (Flip monsters' effects are not activated at this time), also inflict 500 damage to your opponent for each Effect Monster on the field.

Celtic Guardian
An elf who learned to wield a sword, he baffles enemies with lightning-swift attacks.

Cemetary Bomb
Inflict 100 damage to your opponent for each card in their Graveyard.

Centrifugal Field
When a Fusion Monster(s) is destroyed by a card effect and sent to the Graveyard: Its owner targets 1 Fusion Material Monster in their Graveyard that is listed on that Fusion Monster; that player Special Summons that target.