Great Unclean One

Wither.
If this card is put into your graveyard from the battlefield return it to your hand at the beginning of the next end step.
Great Unclean One’s power and toughness are unaffected by -1/-1 counters.
Sacrifice a creature: Place X -1/-1 counters on creatures target opponent controls where X is equal to that creatures power. That player then puts half that many -1/-1 counters rounded up on creatures you control.