Phantom Stag

Phantom Stag enters the battlefield with
a +1/+1 counter on it.
If damage would be dealt to Phantom Stag,
prevent that damage. Remove a +1/+1 counter
from Phantom Stag.
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.)