Midnight Banshee 
Creature — Spirit
$0.24 #4694 0.40 18.3 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%
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"At the beginning of your upkeep, put a -1/-1 counter on each creature."
Darkness Descends90%
$0.27↑#10402↓0.00↓0.6 years↓
"Put two -1/-1 counters on each creature."
Festergloom90%
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"Nonblack creatures get -1/-1 until end of turn."
Soul Snuffers89%
$0.27↑#50380.21↓18.1 years
"When this creature enters, put a -1/-1 counter on each creature."
Ascendant Evincar82%
$2.86↑#11662↓0.23↓26.6 years↑
"Nonblack creatures get -1/-1."
Blight-Breath Catoblepas81%
$0.07↓#24733↓0.06↓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."
Gloomdrifter80%
$0.28↑#27337↓0.4324.6 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.""
Nightshade Seer80%
$0.17↓#31275↓0.22↓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."
, : 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%
$0.23↓#29060↓0.00↓28.5 years↑
"Other black creatures get -1/-1."
Urborg Shambler80%
$0.32↑#29571↓0.22↓25.9 years↑
"Other black creatures get -1/-1."
Night of Souls' Betrayal80%
$2.02↑#10440↓0.91↑21.9 years↑
"All creatures get -1/-1."
Kaervek, the Spiteful79%
$0.28↑#9999↓0.386.2 years↓
"Other creatures get -1/-1."
Choking Fumes78%
$0.08↓#25749↓0.69↑15.6 years↓
"Put a -1/-1 counter on each attacking creature."
Gnarled Effigy78%
$0.18↓#27488↓0.24↓18.3 years
"
, : Put a -1/-1 counter on target creature."
, : Put a -1/-1 counter on target creature."
Torture78%
$0.09↓#23874↓0.4730.9 years↑
"
: Put a -1/-1 counter on enchanted creature."
: Put a -1/-1 counter on enchanted creature."
Skinrender76%
$0.17↓#5738↓0.4015.9 years↓
"When this creature enters, put three -1/-1 counters on target creature."
Lockjaw Snapper76%
$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."
+1 more matching line
Cultbrand Cinder76%
$0.11↓#30299↓0.00↓18.3 years
"When this creature enters, put a -1/-1 counter on target creature."
Scent of Nightshade75%
$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."
Carnifex Demon74%
$0.21↓#50460.21↓15.9 years↓
", Remove a -1/-1 counter from this creature: Put a -1/-1 counter on each other creature."
, Remove a -1/-1 counter from this creature: Put a -1/-1 counter on each other creature."+1 more matching line