Volrath, the Shapestealer

CMC 5

Legendary Creature — Phyrexian Shapeshifter

At the beginning of combat on your turn, put a -1/-1 counter on up to one target creature. : Until your next turn, Volrath becomes a copy of target creature with a counter on it, except it's 7/5 and it has this ability.

P/T: 7/5