Zombieman, Subject No. 66

When Zombieman enters the battlefield,
if it has a +1/+1 counter on it, remove a
+1/+1 from it, then you may put a -1/-1
counter on 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.)