Festergloom 
Sorcery
$0.05 #23332 0.24 12.3 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%
$0.22↑#4679↑0.61↑18.5 years↑
"At the beginning of your upkeep, put a -1/-1 counter on each nonblack creature."
Ascendant Evincar88%
$2.81↑#12050↑0.00↓26.7 years↑
"Nonblack creatures get -1/-1."
Scent of Nightshade87%
$0.12↑#29599↓0.06↓27.4 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%
$0.10↑#219310.07↓24.0 years↑
"All creatures get -2/-2 until end of turn."
Languish86%
$0.35↑#5753↑0.2611.3 years
"All creatures get -4/-4 until end of turn."
Nausea86%
$0.03↓#18163↑0.06↓28.3 years↑
"All creatures get -1/-1 until end of turn."
Shrivel86%
$0.10↑#188540.07↓16.5 years↑
"All creatures get -1/-1 until end of turn."
Blight-Breath Catoblepas86%
$0.09↑#250300.00↓6.7 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%
$0.39↑#12533↑0.324.0 years↓
"All creatures get -3/-3 until end of turn."
Nightshade Seer85%
$0.17↑#31603↓0.00↓27.4 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%
$0.18↑#29871↓0.2225.4 years↑
"All creatures get -1/-1 until end of turn for each basic land type among lands you control."
Stronghold Taskmaster84%
$0.14↑#29312↓0.1928.6 years↑
"Other black creatures get -1/-1."
Urborg Shambler84%
$0.31↑#29733↓0.2726.0 years↑
"Other black creatures get -1/-1."
Gloomdrifter84%
$0.26↑#276470.40↑24.7 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%
$2.01↑#10844↑0.60↑22.1 years↑
"All creatures get -1/-1."
Hazardous Conditions83%
$0.06↑#28996↓0.40↑10.1 years↓
"Creatures with no counters on them get -2/-2 until end of turn."
Kaervek, the Spiteful82%
$0.29↑#10369↑0.58↑6.3 years↓
"Other creatures get -1/-1."
Mephitic Vapors80%
$0.11↑#212060.00↓8.0 years↓
"All creatures get -1/-1 until end of turn."
Toxic Deluge80%
$5.07↑#66↑0.81↑13.0 years
"All creatures get -X/-X until end of turn."
Holy Light80%
$2.40↑#29628↓0.12↓32.2 years↑
"Nonwhite creatures get -1/-1 until end of turn."