Two-Headed Scourge

Tribute 2 (As this creature enters the battlefield, an opponent of your choice may place two +1/+1 counters on it.)
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.)
Two heads. Four fangs. One hell of a nuisance.