Krazy Kow 
Creature — Cow
At the beginning of your upkeep, roll a six-sided die. If you a roll a 1, sacrifice this creature and it deals 3 damage to each creature and each player.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyNOT LEGALvintageNOT LEGALcommanderNOT LEGAL