Unholy Being

Changeling (This creature is all creature types.)
Undying (Whenever this creature would die, if
it had no +1/+1 counters on it, return it to the battlefield with a +1/+1 counter on it.)
Persist (Whenever this creature would die, if
it had no -1/-1 counters on it, return it to the battlefield
with a -1/-1 counter on it.)
Hexproof