doppelganger

{u}:Exile doppelganger.Return it to the battlefield
under it's owners control,at the beginning of
the next end step.
{u}: doppelganger is unblockable this turn.
{1}: doppelganger gets +1/-1 until end of turn.
{1}: doppelganger gets -1/+1 until end of turn.

"Shape-shifting demon."