Bottomless Pool // Locker Room - Duskmourn: House of Horror - 43

Enchantment — Room

Mana Cost: {4}{U}

Whenever one or more creatures you control deal combat damage to a player, draw a card.
(You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.)

Uncommon · Duskmourn: House of Horror · #43 (DSK)

Illustrated by Diana Franco