Immorium, the Unbroken

Immorium, the Unbroken enters the battlefield
with five +1/+1 counters on it.
Whenever Immorium deals lethal damage to a
creature, remove a +1/+1 counter from it. Then
it fights another target creature.
Undying (When this creature dies, 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.)