Case of the Market Melee is a uncommon Enchantment — Case card from Alchemy: Murders at Karlov Manor (YMKM), collector number 13.
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.