Bone Devourer
From Tarkir: Dragonstorm Commander set
Bone Devourer
Creature — Dragon
2/2
Flash
Flying
This creature enters with a number of +1/+1 counters on it equal to the number of creatures that died this turn.
When this creature dies, you draw X cards and you lose X life, where X is the number of +1/+1 counters on it.