Deluge of Doom 
Sorcery
$0.24 #10687 0.13 2.1 years
All creatures get -X/-X until end of turn, where X is the number of card types among cards in your graveyard.
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Cards similar to Deluge of Doom 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.
Tooth Collector86%
$0.05↓#25910↓0.1810.6 years↑
"At the beginning of each opponent's upkeep, if there are four or more card types among cards in your graveyard, target creature that player controls gets -1/-1 until end of turn."
Planar Despair85%
$0.18↓#29871↓0.2225.4 years↑
"All creatures get -1/-1 until end of turn for each basic land type among lands you control."
Terror Tide82%
$0.28↑#7104↑0.172.9 years
"All creatures get -X/-X until end of turn, where X is the number of permanent cards in your graveyard."
Languish82%
$0.35↑#5753↑0.26↑11.3 years↑
"All creatures get -4/-4 until end of turn."
Nausea82%
$0.03↓#18163↓0.0628.3 years↑
"All creatures get -1/-1 until end of turn."
Shrivel82%
$0.10↓#18854↓0.0716.5 years↑
"All creatures get -1/-1 until end of turn."
Infest82%
$0.10↓#21931↓0.0724.0 years↑
"All creatures get -2/-2 until end of turn."
Blight Grenade81%
$0.39↑#125330.32↑4.0 years↑
"All creatures get -3/-3 until end of turn."
Drag to the Bottom80%
$0.12↓#21670↓0.224.1 years↑
"Each creature gets -X/-X until end of turn, where X is 1 plus the number of basic land types among lands you control."
Let's Play a Game79%
$0.20↓#94930.192.1 years
"• Creatures your opponents control get -1/-1 until end of turn."
Night of Souls' Betrayal78%
$2.01↑#108440.60↑22.1 years↑
"All creatures get -1/-1."
Kaervek, the Spiteful78%
$0.29↑#103690.58↑6.3 years↑
"Other creatures get -1/-1."
Mephitic Vapors77%
$0.11↓#21206↓0.00↓8.0 years↑
"All creatures get -1/-1 until end of turn."
Hazardous Conditions77%
$0.06↓#28996↓0.40↑10.1 years↑
"Creatures with no counters on them get -2/-2 until end of turn."
Toxic Deluge76%
$5.07↑#66↑0.81↑13.0 years↑
"All creatures get -X/-X until end of turn."
Death's-Head Buzzard76%
$0.08↓#23138↓0.1023.4 years↑
"When this creature dies, all creatures get -1/-1 until end of turn."
Havoc Demon76%
$0.14↓#22009↓0.1623.7 years↑
"When this creature dies, all creatures get -5/-5 until end of turn."
Witch's Vengeance75%
$0.30↑#22236↓0.177.0 years↑
"Creatures of the creature type of your choice get -3/-3 until end of turn."
Rollick of Abandon75%
$0.03↓#30002↓0.27↑12.5 years↑
"All creatures get +2/-2 until end of turn."
Hideous Laughter74%
$0.19↓#25470↓0.31↑22.1 years↑
"All creatures get -2/-2 until end of turn."