Hungry Hungry Heifer 
Creature — Cow
At the beginning of your upkeep, you may remove a counter from a permanent you control. If you don't, sacrifice this creature.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyNOT LEGALvintageNOT LEGALcommanderNOT LEGAL