Anomalous corruption

Whenever Anomalous corruption deals combat damage to a player, reveal the top card of their library. If that card shares the same converted mana cost with Anomalous corruption, put a +1/+1 counter on Anomalous corruption.
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.)