Cloudkill 
Sorcery
$0.21 #16135 0.30 4.2 years
All creatures get -X/-X until end of turn, where X is the greatest mana value of a commander you own on the battlefield or in the command zone.
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Cards similar to Cloudkill 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.
Nausea87%
$0.03↓#175560.00↓28.2 years↑
"All creatures get -1/-1 until end of turn."
Shrivel87%
$0.10↓#182430.2416.4 years↑
"All creatures get -1/-1 until end of turn."
Infest87%
$0.13↓#21635↓0.05↓23.9 years↑
"All creatures get -2/-2 until end of turn."
Languish87%
$0.34↑#5680↑0.19↓11.1 years↑
"All creatures get -4/-4 until end of turn."
Night of Souls' Betrayal84%
$2.02↑#10440↑0.91↑21.9 years↑
"All creatures get -1/-1."
Toxic Deluge83%
$4.49↑#67↑0.87↑12.8 years↑
"All creatures get -X/-X until end of turn."
Kaervek, the Spiteful83%
$0.28↑#9999↑0.386.2 years↑
"Other creatures get -1/-1."
Drag to the Bottom81%
$0.06↓#21276↓0.07↓4.0 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."
Induce Despair79%
$0.06↓#28271↓0.2816.4 years↑
"Target creature gets -X/-X until end of turn, where X is the revealed card's mana value."
Hideous Laughter78%
$0.20↓#25202↓0.3021.9 years↑
"All creatures get -2/-2 until end of turn."
Flowstone Slide78%
$0.15↓#27736↓0.2926.6 years↑
"All creatures get +X/-X until end of turn."
Blight Grenade78%
$0.38↑#12213↑0.05↓3.9 years
"All creatures get -3/-3 until end of turn."
Final Revels77%
$0.16↓#31154↓0.06↓18.9 years↑
"• All creatures get -0/-2 until end of turn."
Planar Despair76%
$0.16↓#29423↓0.12↓25.3 years↑
"All creatures get -1/-1 until end of turn for each basic land type among lands you control."
Withering Curse75%
$1.38↑#10534↑0.00↓0.4 years↓
"All creatures get -2/-2 until end of turn."
Hazardous Conditions75%
$0.05↓#28718↓0.389.9 years↑
"Creatures with no counters on them get -2/-2 until end of turn."
Mephitic Vapors74%
$0.11↓#20591↓0.367.9 years↑
"All creatures get -1/-1 until end of turn."
Biting Rain74%
$0.12↓#155230.3810.4 years↑
"All creatures get -2/-2 until end of turn."
Rollick of Abandon73%
$0.04↓#29699↓0.2912.3 years↑
"All creatures get +2/-2 until end of turn."
Yahenni's Expertise72%
$0.42↑#8612↑0.44↑9.6 years↑
"All creatures get -3/-3 until end of turn."