Festergloom 
Sorcery
$0.06 #22598 0.29 12.1 years
Nonblack creatures get -1/-1 until end of turn.
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Cards similar to Festergloom 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.
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."
Ascendant Evincar88%
$2.86↑#11662↑0.2326.6 years↑
"Nonblack creatures get -1/-1."
Scent of Nightshade87%
$0.12↑#29355↓0.00↓27.2 years↑
"Reveal any number of black cards in your hand. Target creature gets -X/-X until end of turn, where X is the number of cards revealed this way."
Infest86%
$0.13↑#216350.05↓23.9 years↑
"All creatures get -2/-2 until end of turn."
Languish86%
$0.34↑#5680↑0.1911.1 years
"All creatures get -4/-4 until end of turn."
Nausea86%
$0.03↓#17556↑0.00↓28.2 years↑
"All creatures get -1/-1 until end of turn."
Shrivel86%
$0.10↑#182430.2416.4 years↑
"All creatures get -1/-1 until end of turn."
Blight-Breath Catoblepas86%
$0.07↑#247330.06↓6.6 years↓
"When this creature enters, target creature an opponent controls gets -X/-X until end of turn, where X is your devotion to black."
Blight Grenade85%
$0.38↑#12213↑0.05↓3.9 years↓
"All creatures get -3/-3 until end of turn."
Nightshade Seer85%
$0.17↑#31275↓0.2227.2 years↑
", 
: Reveal any number of black cards in your hand. Target creature gets -X/-X until end of turn, where X is the number of cards revealed this way."
, : Reveal any number of black cards in your hand. Target creature gets -X/-X until end of turn, where X is the number of cards revealed this way."
Planar Despair84%
$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."
Stronghold Taskmaster84%
$0.23↑#29060↓0.00↓28.5 years↑
"Other black creatures get -1/-1."
Urborg Shambler84%
$0.32↑#29571↓0.2225.9 years↑
"Other black creatures get -1/-1."
Gloomdrifter84%
$0.28↑#27337↓0.43↑24.6 years↑
"As long as there are seven or more cards in your graveyard, this creature has "When this creature enters, nonblack creatures get -2/-2 until end of turn.""
Night of Souls' Betrayal83%
$2.02↑#10440↑0.91↑21.9 years↑
"All creatures get -1/-1."
Hazardous Conditions83%
$0.05↓#28718↓0.389.9 years↓
"Creatures with no counters on them get -2/-2 until end of turn."
Kaervek, the Spiteful82%
$0.28↑#9999↑0.386.2 years↓
"Other creatures get -1/-1."
Toxic Deluge82%
$4.49↑#67↑0.87↑12.8 years
"All creatures get -X/-X until end of turn."
Holy Light82%
$2.43↑#29327↓0.2932.1 years↑
"Nonwhite creatures get -1/-1 until end of turn."
Mephitic Vapors80%
$0.11↑#205910.367.9 years↓
"All creatures get -1/-1 until end of turn."