Skinstealer

Devourmorph — 1 (You may cast this card
face down as a 2/2 creature for {3}. Turn it face
up any time by sacrificing a creature and put a +1/+1 counter on it.)
When Skinstealer is turned face up, if its Devourmorph cost was paid, it becomes a
copy of the sacrificed creature, except it has:
"{t}: Turn this creature face down."