Midnight Banshee 
Creature — Spirit
$0.22 #4679 0.61 18.5 years
Wither (This deals damage to creatures in the form of -1/-1 counters.)
At the beginning of your upkeep, put a -1/-1 counter on each nonblack creature.
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Cards similar to Midnight Banshee 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 Night92%
$24.09↑#14367↓1.29↑30.0 years↑
"At the beginning of your upkeep, put a -1/-1 counter on each creature."
Festergloom90%
$0.05↓#23332↓0.24↓12.3 years↓
"Nonblack creatures get -1/-1 until end of turn."
Soul Snuffers89%
$0.26↑#49570.5618.2 years
"When this creature enters, put a -1/-1 counter on each creature."
Darkness Descends87%
$0.26↑#10057↓0.37↓0.7 years↓
"Put two -1/-1 counters on each creature."
Ascendant Evincar82%
$2.81↑#12050↓0.00↓26.7 years↑
"Nonblack creatures get -1/-1."
Blight-Breath Catoblepas81%
$0.09↓#25030↓0.00↓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."
Gloomdrifter80%
$0.26↑#27647↓0.40↓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.""
Nightshade Seer80%
$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."
Stronghold Taskmaster80%
$0.14↓#29312↓0.19↓28.6 years↑
"Other black creatures get -1/-1."
Urborg Shambler80%
$0.31↑#29733↓0.27↓26.0 years↑
"Other black creatures get -1/-1."
Night of Souls' Betrayal80%
$2.01↑#10844↓0.6022.1 years↑
"All creatures get -1/-1."
Kaervek, the Spiteful79%
$0.29↑#10369↓0.586.3 years↓
"Other creatures get -1/-1."
Gnarled Effigy78%
$0.15↓#27769↓0.07↓18.5 years
"
, : Put a -1/-1 counter on target creature."
, : Put a -1/-1 counter on target creature."
Torture78%
$0.09↓#24150↓0.18↓31.1 years↑
"
: Put a -1/-1 counter on enchanted creature."
: Put a -1/-1 counter on enchanted creature."
Choking Fumes77%
$0.13↓#25942↓0.00↓15.7 years↓
"Put a -1/-1 counter on each attacking creature."
Skinrender76%
$0.23↑#5692↓0.6916.1 years↓
"When this creature enters, put three -1/-1 counters on target creature."
Lockjaw Snapper76%
$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."
+1 more matching line
Cultbrand Cinder76%
$0.11↓#30659↓0.00↓18.5 years
"When this creature enters, put a -1/-1 counter on target creature."
Blight Rot75%
$0.28↑#8917↓0.04↓0.7 years↓
"Put four -1/-1 counters on target creature."
Scent of Nightshade75%
$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."