Shambling Mound

Shambling Mounds power and toughness are equal to the highest power and toughness among creatures
your opponents control +1.
You can pay {b} to remove a -1/-1 counter from Shambling Mound.
Persist. (When this creature is put into a graveyard from the battlefield, if it had no -1/-1 counters on it, return it to the battlefield under its owner’s control with a -1/-1 counter on it.)