Ravenous Vampire 
Creature — Vampire
Flying At the beginning of your upkeep, you may sacrifice a nonartifact creature. If you do, put a +1/+1 counter on this creature. If you don't, tap this creature.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL