Cloud of Darkness 
Legendary Creature — Avatar
$0.13 #16987 0.27 1.2 years
Flying
Particle Beam — When Cloud of Darkness enters, target creature an opponent controls gets -X/-X until end of turn, where X is the number of permanent cards in your graveyard.
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Cards similar to Cloud of Darkness 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.
Chupacabra Echo100%
$0.19↑#13413↑0.212.8 years↑
"When this creature enters, target creature an opponent controls gets -X/-X until end of turn, where X is the number of permanent cards in your graveyard."
Keening Banshee88%
$0.12↓#27308↓0.00↓21.0 years↑
"When this creature enters, target creature gets -2/-2 until end of turn."
+1 more matching line
Eyeblight Assassin87%
$0.07↓#21888↓0.3111.1 years↑
"When this creature enters, target creature an opponent controls gets -1/-1 until end of turn."
Blister Beetle86%
$0.05↓#24629↓0.2917.9 years↑
"When this creature enters, target creature gets -1/-1 until end of turn."
Farbog Boneflinger86%
$0.06↓#30716↓0.2914.6 years↑
"When this creature enters, target creature gets -2/-2 until end of turn."
Skulking Killer86%
$0.10↓#25265↓0.00↓4.8 years↑
"When this creature enters, target creature an opponent controls gets -2/-2 until end of turn if that opponent controls no other creatures."
Gnarlroot Pallbearer86%
$0.13#23506↓0.47↑3.8 years↑
"When this creature enters, target creature gets +X/+X until end of turn, where X is the number of creature cards in your graveyard."
Phyrexian Debaser86%
$0.04↓#28872↓0.05↓27.6 years↑
"Flying"
Fourth Bridge Prowler86%
$0.21↑#145120.00↓9.6 years↑
"When this creature enters, you may have target creature get -1/-1 until end of turn."
Festive Funeral85%
$0.15↑#25718↓0.246.9 years↑
"Target creature gets -X/-X until end of turn, where X is the number of cards in your graveyard."
Necrotic Wound85%
$0.13#183560.187.9 years↑
"Target creature gets -X/-X until end of turn, where X is the number of creature cards in your graveyard. If that creature would die this turn, exile it instead."
Terror Tide84%
$0.26↑#6795↑0.342.8 years↑
"All creatures get -X/-X until end of turn, where X is the number of permanent cards in your graveyard."
Ossuary Rats82%
$0.22↑#20595↓0.00↓3.8 years↑
"When this creature enters, it deals X damage to target creature or planeswalker an opponent controls, where X is the number of creature cards in your graveyard."
Ambush Gigapede82%
$0.12↓#203380.00↓2.4 years↑
"When this creature enters, target creature an opponent controls gets -2/-2 until end of turn."
Scorpion's Sting82%
$0.15↑#140900.221.0 years
"Target creature gets -3/-3 until end of turn."
Lotleth Giant81%
$0.13#12317↑0.41↑7.9 years↑
"When this creature enters, it deals 1 damage to target opponent for each creature card in your graveyard."
Shefet Archfiend81%
$0.23↑#160650.16↓1.6 years
"Flying"
Syndicate Infiltrator80%
$0.11↓#27274↓0.254.4 years↑
"Flying"
Lash of the Whip80%
$0.03↓#28857↓0.57↑12.9 years↑
"Target creature gets -4/-4 until end of turn."
Grasp of Darkness80%
$0.10↓#11433↑0.11↓15.9 years↑
"Target creature gets -4/-4 until end of turn."