Longhorn Firebeast 
Creature — Elemental Ox Beast
When this creature enters, any opponent may have it deal 5 damage to them. If a player does, sacrifice this creature.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL