Darkness Descends 
Sorcery
$0.26 #10057 0.37 0.7 years
Put two -1/-1 counters on each creature.
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Cards similar to Darkness Descends 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.
Harbinger of Night94%
$24.09↑#14367↓1.29↑30.0 years↑
"At the beginning of your upkeep, put a -1/-1 counter on each creature."
Soul Snuffers94%
$0.26#4957↑0.56↑18.2 years↑
"When this creature enters, put a -1/-1 counter on each creature."
Night of Souls' Betrayal90%
$2.01↑#108440.60↑22.1 years↑
"All creatures get -1/-1."
Nausea90%
$0.03↓#18163↓0.06↓28.3 years↑
"All creatures get -1/-1 until end of turn."
Shrivel90%
$0.10↓#18854↓0.07↓16.5 years↑
"All creatures get -1/-1 until end of turn."
Infest90%
$0.10↓#21931↓0.07↓24.0 years↑
"All creatures get -2/-2 until end of turn."
Languish90%
$0.35↑#5753↑0.26↓11.3 years↑
"All creatures get -4/-4 until end of turn."
Kaervek, the Spiteful90%
$0.29↑#103690.58↑6.3 years↑
"Other creatures get -1/-1."
Choking Fumes88%
$0.13↓#25942↓0.00↓15.7 years↑
"Put a -1/-1 counter on each attacking creature."
Black Sun's Zenith88%
$0.36↑#1937↑0.48↑15.7 years↑
"Put X -1/-1 counters on each creature. Shuffle this card into its owner's library."
Midnight Banshee87%
$0.22↓#4679↑0.61↑18.5 years↑
"At the beginning of your upkeep, put a -1/-1 counter on each nonblack creature."
Toxic Deluge86%
$5.07↑#66↑0.81↑13.0 years↑
"All creatures get -X/-X until end of turn."
Drag to the Bottom85%
$0.12↓#21670↓0.22↓4.1 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."
Blight Rot84%
$0.28↑#89170.04↓0.7 years
"Put four -1/-1 counters on target creature."
Hazardous Conditions84%
$0.06↓#28996↓0.4010.1 years↑
"Creatures with no counters on them get -2/-2 until end of turn."
Lockjaw Snapper84%
$1.54↑#16140↓0.18↓18.5 years↑
"When this creature dies, put a -1/-1 counter on each creature with a -1/-1 counter on it."
Planar Despair84%
$0.18↓#29871↓0.22↓25.4 years↑
"All creatures get -1/-1 until end of turn for each basic land type among lands you control."
Hideous Laughter82%
$0.19↓#25470↓0.3122.1 years↑
"All creatures get -2/-2 until end of turn."
Withering Curse82%
$0.99↑#97840.50↑0.5 years
"All creatures get -2/-2 until end of turn."
Blight Grenade82%
$0.39↑#12533↓0.324.0 years↑
"All creatures get -3/-3 until end of turn."