Darkness Descends 
Sorcery
$0.27 #10402 0.00 0.6 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 Night96%
$28.20↑#14222↓0.50↑29.9 years↑
"At the beginning of your upkeep, put a -1/-1 counter on each creature."
Soul Snuffers96%
$0.27#5038↑0.21↑18.1 years↑
"When this creature enters, put a -1/-1 counter on each creature."
Choking Fumes90%
$0.08↓#25749↓0.69↑15.6 years↑
"Put a -1/-1 counter on each attacking creature."
Midnight Banshee90%
$0.24↓#4694↑0.40↑18.3 years↑
"At the beginning of your upkeep, put a -1/-1 counter on each nonblack creature."
Lockjaw Snapper88%
$1.11↑#15839↓0.29↑18.3 years↑
"When this creature dies, put a -1/-1 counter on each creature with a -1/-1 counter on it."
Hazardous Conditions88%
$0.05↓#28718↓0.38↑9.9 years↑
"Creatures with no counters on them get -2/-2 until end of turn."
Black Sun's Zenith87%
$0.35↑#1936↑0.39↑15.6 years↑
"Put X -1/-1 counters on each creature. Shuffle this card into its owner's library."
Planar Despair87%
$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."
Nausea86%
$0.03↓#17556↓0.0028.2 years↑
"All creatures get -1/-1 until end of turn."
Shrivel86%
$0.10↓#18243↓0.24↑16.4 years↑
"All creatures get -1/-1 until end of turn."
Infest86%
$0.13↓#21635↓0.0523.9 years↑
"All creatures get -2/-2 until end of turn."
Languish86%
$0.34↑#5680↑0.19↑11.1 years↑
"All creatures get -4/-4 until end of turn."
Blight Rot86%
$0.25↓#92170.000.6 years
"Put four -1/-1 counters on target creature."
Blight Grenade86%
$0.38↑#122130.053.9 years↑
"All creatures get -3/-3 until end of turn."
Night of Souls' Betrayal86%
$2.02↑#104400.91↑21.9 years↑
"All creatures get -1/-1."
Scar86%
$0.23↓#19614↓0.29↑18.3 years↑
"Put a -1/-1 counter on target creature."
Kaervek, the Spiteful85%
$0.28↑#99990.38↑6.2 years↑
"Other creatures get -1/-1."
Splendid Agony84%
$0.14↓#15059↓0.009.4 years↑
"Distribute two -1/-1 counters among one or two target creatures."
Instill Infection84%
$0.11↓#23712↓0.0715.9 years↑
"Put a -1/-1 counter on target creature."
Toxic Deluge83%
$4.49↑#67↑0.87↑12.8 years↑
"All creatures get -X/-X until end of turn."