Phantom of Chaos (Starfoil)

DARKEffect Monster

Any Battle Damage your opponent takes from battles involving this card becomes 0. Once per turn: You can target 1 Effect Monster in your Graveyard; banish that target, then, until the End Phase, this card's name and ATK become that monster's name and ATK, and it gains that monster's effects. You must control this face-up card to activate and to resolve this effect.