Trample, First Strike. During your upkeep, put a -2/-2 counter on Ebon Praetor. You may sacrifice a creature during your upkeep to remove a -2/-2 counter from Ebon Praetor. If the creature sacrificed was a Thrull, also put a +1/+0 counter on Ebon Praetor. Only one creature may be sacrificed in this manner each turn.