Case of the Market Melee 

Enchantment — Case
When this Case enters, it deals 1 damage to any target. Damage isn't removed from creatures during cleanup steps. To solve — Three or more creatures are damaged. Solved — Whenever you attack with one or more creatures, this Case deals that much damage divided as you choose among any number of targets.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyNOT LEGALvintageNOT LEGALcommanderNOT LEGAL