Unyielding Assailant

Haste, Afflict 2
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.)
At the end of your turn, sacrifice Unyielding
Assailant if it has any +1/+1 counters on it.