Cramped Vents // Access Maze - Duskmourn: House of Horror Commander - 17

Enchantment — Room

Mana Cost: {5}{B}{B}

Once during each of your turns, you may cast a spell from your hand by paying life equal to its mana value rather than paying its mana cost.
(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.)

Rare · Duskmourn: House of Horror Commander · #17 (DSC)

Illustrated by Arthur Yuan