Polluted Cistern // Dim Oubliette 
// 
Enchantment — Room // Enchantment — Room
$0.38 #6737 0.11 2.1 years
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 similar to Polluted Cistern // Dim Oubliette expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Dreadhound85%
$0.16↓#58310.27↑5.1 years↑
"Whenever a creature dies or a creature card is put into a graveyard from a library, each opponent loses 1 life."
+1 more matching line
Summon Undead83%
$0.15↓#14543↓0.00↓4.4 years↑
"You may mill three cards. Then return a creature card from your graveyard to the battlefield."
Mindwrack Demon78%
$0.37↓#20030↓0.0610.6 years↑
"At the beginning of your upkeep, you lose 4 life unless there are four or more card types among cards in your graveyard."
+1 more matching line
Colossal Grave-Reaver77%
$11.20↑#1852↑0.73↑1.5 years
"Whenever one or more creature cards are put into your graveyard from your library, put one of them onto the battlefield."
Funeral Room // Awakening Hall76%
$5.72↑#2140↑0.22↑2.1 years
"When you unlock this door, return all creature cards from your graveyard to the battlefield."
+1 more matching line
Gibbering Fiend75%
$0.32↓#14086↓0.00↓10.5 years↑
"At the beginning of each opponent's upkeep, if there are four or more card types among cards in your graveyard, this creature deals 1 damage to that player."
Manic Scribe74%
$0.30↓#10359↓0.40↑10.5 years↑
"At the beginning of each opponent's upkeep, if there are four or more card types among cards in your graveyard, that player mills three cards."
Incarnation Technique74%
$9.57↑#3605↑0.36↑5.5 years↑
"Mill five cards, then return a creature card from your graveyard to the battlefield."
Crawling Infestation73%
$0.24↓#4674↑0.104.9 years↑
"At the beginning of your upkeep, you may mill two cards."
Angrath, the Flame-Chained72%
$3.18↑#10218↓0.25↑8.8 years↑
"−8: Each opponent loses life equal to the number of cards in their graveyard."
Black Widow, Daring Operative72%
$2.96↑#21682↓0.43↑0.3 years↓
"When this card enters, mill three cards."
+1 more matching line
Poison-Tip Archer70%
$0.60↑#1681↑0.34↑8.3 years↑
"Whenever another creature dies, each opponent loses 1 life."
Reya Dawnbringer70%
$0.41↑#3790↑0.25↑26.0 years↑
"At the beginning of your upkeep, you may return target creature card from your graveyard to the battlefield."
Ultron the Annihilator70%
$19.57↑#12810↓0.47↑0.3 years↓
"Whenever another artifact is put into your graveyard from the battlefield or an artifact card is put into your graveyard from anywhere other than the battlefield, each opponent loses 1 life."
Patchwork Beastie70%
$0.27↓#12644↓0.00↓2.1 years
"At the beginning of your upkeep, you may mill a card."