Delvefall
Polluted Cistern // Dim Oubliette

Polluted Cistern // Dim Oubliette {1}{B} // {4}{B}

Enchantment — Room // Enchantment — Room

Whenever one or more cards are put into your graveyard from your library, each opponent loses 1 life for each card type among those cards.
(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.)
When you unlock this door, mill three cards, then return a creature card from your graveyard to the battlefield.
(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?

One Ring to Rule Them All
One Ring to Rule Them All 86%
$2.38#3184
"Each opponent loses 1 life for each creature card in that player's graveyard."
Origin of Black Widow
Origin of Black Widow 86%
$0.75#26998
"Each opponent loses 1 life for each creature card in their graveyard."
Marionette Apprentice
Marionette Apprentice 85%
$0.83#560
"Whenever another creature or artifact you control is put into a graveyard from the battlefield, each opponent loses 1 life."
Faerie Tauntings
Faerie Tauntings 83%
$2.57#11286
"Whenever you cast a spell during an opponent's turn, you may have each opponent lose 1 life."
The Celestial Toymaker
The Celestial Toymaker 82%
$30.39#16590
"At the beginning of each end step, each opponent loses 2 life for each spell or ability that caused one or more players to guess or to group cards or permanents into a pile this turn."
Hollowborn Barghest
Hollowborn Barghest 81%
$0.33#26076
"At the beginning of each opponent's upkeep, if that player has no cards in hand, they lose 2 life."
Agent of the Iron Throne
Agent of the Iron Throne 80%
$0.41#2216
"Commander creatures you own have "Whenever an artifact or creature you control is put into a graveyard from the battlefield, each opponent loses 1 life.""
Bandit's Talent
Bandit's Talent 80%
$0.35#4228
"At the beginning of each opponent's upkeep, if that player has one or fewer cards in hand, they lose 2 life."