Slifer the Sky Dragon (Ultra Rare) [GBI-001] Ultra Rare Common they must discard all copies

they must discard all copies of it in their hand

Set: OTS Tournament Pack 1 Card type: Fusion/Effect Monster Rarity: Ultimate Rare Attack: 2400 Defense: 1800 Must be Special Summoned with "Mask Change" and cannot be Special Summoned by other ways

Once per turn: You can Special Summon 1 Dragon-Type monster from your hand or Graveyard

or card effects

negate that activation

Slifer the Sky Dragon (Ultra Rare) [GBI-001] Ultra Rare Common they must discard all copiesSet: American God Cards Card type: Normal Monster Rarity: Ultra Rare Attack: X000 Defense: X000 The heavens twist and thunder roars, signaling the coming of this ancient creature, and the dawn of true power.