Delvefall
Cramped Vents // Access Maze

Cramped Vents // Access Maze {3}{B} // {5}{B}{B}

Enchantment — Room // Enchantment — Room

When you unlock this door, this Room deals 6 damage to target creature an opponent controls. You gain life equal to the excess damage dealt this way.
(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.)
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.)

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Cards that do something similar expected a card that isn't here?

Glassworks // Shattered Yard
Glassworks // Shattered Yard 88%
$0.21#8772
"When you unlock this door, this Room deals 4 damage to target creature an opponent controls."
Demon of Fate's Design
Demon of Fate's Design 88%
$0.33#3012
"Once during each of your turns, you may cast an enchantment spell by paying life equal to its mana value rather than paying its mana cost."
One with the Multiverse
One with the Multiverse 81%
$2.01#1914
"Once during each of your turns, you may cast a spell from your hand or the top of your library without paying its mana cost."