Deluge of Doom 
Sorcery
$0.24 #10104 0.13 1.9 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↓#25459↓0.47↑10.5 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%
$0.16↓#29423↓0.1225.3 years↑
"All creatures get -1/-1 until end of turn for each basic land type among lands you control."
Terror Tide82%
$0.26↑#6795↑0.34↑2.8 years
"All creatures get -X/-X until end of turn, where X is the number of permanent cards in your graveyard."
Languish82%
$0.34↑#5680↑0.1911.1 years↑
"All creatures get -4/-4 until end of turn."
Nausea82%
$0.03↓#17556↓0.00↓28.2 years↑
"All creatures get -1/-1 until end of turn."
Shrivel82%
$0.10↓#18243↓0.24↑16.4 years↑
"All creatures get -1/-1 until end of turn."
Infest82%
$0.13↓#21635↓0.0523.9 years↑
"All creatures get -2/-2 until end of turn."
Blight Grenade80%
$0.38↑#12213↓0.053.9 years↑
"All creatures get -3/-3 until end of turn."
Drag to the Bottom80%
$0.06↓#21276↓0.074.0 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%
$0.26↑#92930.201.9 years
"• Creatures your opponents control get -1/-1 until end of turn."
Toxic Deluge78%
$4.49↑#67↑0.87↑12.8 years↑
"All creatures get -X/-X until end of turn."
Night of Souls' Betrayal78%
$2.02↑#104400.91↑21.9 years↑
"All creatures get -1/-1."
Kaervek, the Spiteful78%
$0.28↑#99990.38↑6.2 years↑
"Other creatures get -1/-1."
Hazardous Conditions77%
$0.05↓#28718↓0.38↑9.9 years↑
"Creatures with no counters on them get -2/-2 until end of turn."
Mephitic Vapors76%
$0.11↓#20591↓0.36↑7.9 years↑
"All creatures get -1/-1 until end of turn."
Darkness Descends76%
$0.27↑#104020.00↓0.6 years↓
"Put two -1/-1 counters on each creature."
Death's-Head Buzzard76%
$0.09↓#22498↓0.56↑23.3 years↑
"When this creature dies, all creatures get -1/-1 until end of turn."
Havoc Demon76%
$0.14↓#21730↓0.2023.6 years↑
"When this creature dies, all creatures get -5/-5 until end of turn."
Witch's Vengeance75%
$0.29↑#22007↓0.31↑6.9 years↑
"Creatures of the creature type of your choice get -3/-3 until end of turn."
Rollick of Abandon75%
$0.04↓#29699↓0.29↑12.3 years↑
"All creatures get +2/-2 until end of turn."