Phantom Unicorn

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