Innistrad Nemesi's

Trample, menace.
When Innistrad Nemesi's enter the battlefield sacrifice X permanent.
Innistrad Nemesi's enter the battlefield with X
+1/+1 counter on it.
Innistrad Nemesi's gain +0/+1 for each
permanent in your graveyard.
Sacrifice a creature, Innistrad Nemesi's gain +1/
+0 until end of turn.