Massacre Girl 
Legendary Creature — Human Assassin
$0.47 #1768 0.88 7.5 years
Menace
When Massacre Girl enters, each other creature gets -1/-1 until end of turn. Whenever a creature dies this turn, each creature other than Massacre Girl gets -1/-1 until end of turn.
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Cards similar to Massacre Girl 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.
Death Frenzy92%
$0.12↓#23502↓0.19↓12.1 years↑
"All creatures get -2/-2 until end of turn. Whenever a creature dies this turn, you gain 1 life."
Khenra Scrapper83%
$0.06↓#28293↓0.03↓9.3 years↑
"Menace"
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Shefet Archfiend82%
$0.24↓#16118↓0.33↓1.7 years↓
"When this creature enters, all other creatures get -2/-2 until end of turn."
Nausea82%
$0.03↓#18163↓0.06↓28.3 years↑
"All creatures get -1/-1 until end of turn."
Shrivel82%
$0.10↓#18854↓0.07↓16.5 years↑
"All creatures get -1/-1 until end of turn."
Havoc Demon82%
$0.14↓#22009↓0.16↓23.7 years↑
"When this creature dies, all creatures get -5/-5 until end of turn."
Infest82%
$0.10↓#21931↓0.07↓24.0 years↑
"All creatures get -2/-2 until end of turn."
Languish82%
$0.35↓#5753↓0.26↓11.3 years↑
"All creatures get -4/-4 until end of turn."
Harvester of Misery80%
$1.16↑#14939↓0.11↓2.5 years↓
"When this creature enters, other creatures get -2/-2 until end of turn."
+1 more matching line
Blight Grenade80%
$0.39↓#12533↓0.32↓4.0 years↓
"All creatures get -3/-3 until end of turn."
Ruinous Waterbending79%
$0.23↓#16267↓0.32↓0.9 years↓
"All creatures get -2/-2 until end of turn. If this spell's additional cost was paid, whenever a creature dies this turn, you gain 1 life."
Soul Snuffers79%
$0.26↓#4957↓0.56↓18.2 years↑
"When this creature enters, put a -1/-1 counter on each creature."
Planar Despair78%
$0.18↓#29871↓0.22↓25.4 years↑
"All creatures get -1/-1 until end of turn for each basic land type among lands you control."
Judge Magister Gabranth78%
$0.19↓#9166↓0.25↓1.4 years↓
"Menace"
Kaervek, the Spiteful78%
$0.29↓#10369↓0.58↓6.3 years↓
"Other creatures get -1/-1."
Hazardous Conditions78%
$0.06↓#28996↓0.40↓10.1 years↑
"Creatures with no counters on them get -2/-2 until end of turn."
Stalactite Stalker78%
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"Menace"
Night of Souls' Betrayal77%
$2.01↑#10844↓0.60↓22.1 years↑
"All creatures get -1/-1."
Desperate Measures77%
$0.23↓#11645↓0.06↓1.5 years↓
"Target creature gets +1/-1 until end of turn. When it dies under your control this turn, draw two cards."