Cloud of Darkness 
Legendary Creature — Avatar
$0.14 #17086 0.25 1.4 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%
$0.22↑#137430.192.9 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↓#27674↓0.13↓21.2 years↑
"When this creature enters, target creature gets -2/-2 until end of turn."
Eyeblight Assassin86%
$0.09↓#22239↓0.06↓11.3 years↑
"When this creature enters, target creature an opponent controls gets -1/-1 until end of turn."
Gnarlroot Pallbearer86%
$0.13↓#23909↓0.313.9 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."
Blister Beetle86%
$0.04↓#25026↓0.43↑18.0 years↑
"When this creature enters, target creature gets -1/-1 until end of turn."
Farbog Boneflinger86%
$0.08↓#30945↓0.1814.7 years↑
"When this creature enters, target creature gets -2/-2 until end of turn."
Skulking Killer86%
$0.03↓#25620↓0.06↓4.9 years↑
"When this creature enters, target creature an opponent controls gets -2/-2 until end of turn if that opponent controls no other creatures."
Festive Funeral85%
$0.14#25987↓0.00↓7.0 years↑
"Target creature gets -X/-X until end of turn, where X is the number of cards in your graveyard."
Fourth Bridge Prowler85%
$0.22↑#150290.06↓9.7 years↑
"When this creature enters, you may have target creature get -1/-1 until end of turn."
Necrotic Wound85%
$0.14#186310.12↓8.0 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%
$0.28↑#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."
Revenant84%
$0.06↓#195970.39↑28.7 years↑
"Flying"
Ossuary Rats82%
$0.23↑#20950↓0.293.9 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%
$0.15↑#20735↓0.06↓2.5 years↑
"When this creature enters, target creature an opponent controls gets -2/-2 until end of turn."
Lotleth Giant81%
$0.15↑#12436↑0.47↑8.0 years↑
"When this creature enters, it deals 1 damage to target opponent for each creature card in your graveyard."
Miasma Demon81%
$0.19↑#199470.05↓2.1 years
"Flying"
Shefet Archfiend81%
$0.24↑#161180.331.7 years
"Flying"
Grasp of Darkness79%
$0.09↓#11722↑0.2416.1 years↑
"Target creature gets -4/-4 until end of turn."
Lash of the Whip79%
$0.03↓#29073↓0.06↓13.1 years↑
"Target creature gets -4/-4 until end of turn."
Flatten79%
$0.05↓#28740↓0.00↓11.6 years↑
"Target creature gets -4/-4 until end of turn."