The Fang of Critias [LCKC-EN037] Ultra Rare BT8-090 This card gains ATK equal

This card gains ATK equal to the combined ATK of the monsters equipped to it by this effect

negate that monster effect

make it unable to be destroyed by battle or card effects

except “Ninja” monsters

when your opponent would Special Summon a monster(s): You can return this card from your field to the hand

The Fang of Critias [LCKC-EN037] Ultra Rare BT8-090 This card gains ATK equalSet: Legendary Collection Kaiba Card type: Normal Spell Rarity: Ultra Rare (This card is also always treated as "Legendary Dragon Critias".) Send 1 Trap from your hand or field to the GY, that is listed on a Fusion Monster that can only be Special Summoned with "The Fang of Critias" (if that card is Set, reveal it), then Special Summon that Fusion Monster from your Extra Deck. You can only activate 1 "The Fang of Critias" per turn.