Bone Devourer is a rare Creature — Dragon card from Tarkir: Dragonstorm Commander (TDC), collector number 66. Current market price: $0.56, TCGplayer market prices via Scryfall.
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.