Ebon Praetor

Creature — Avatar Praetor — {4}{B}{B}

First strike, trample At the beginning of your upkeep, put a -2/-2 counter on this creature. Sacrifice a creature: Remove a -2/-2 counter from this creature. If the sacrificed creature was a Thrull, put a +1/+0 counter on this creature. Activate only during your upkeep and only once each turn.