Massacre Girl 
Legendary Creature — Human Assassin
$0.56 #1706 0.59 7.3 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.
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"All creatures get -2/-2 until end of turn."
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"All creatures get -4/-4 until end of turn."
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Blight Grenade80%
$0.38↓#12213↓0.05↓3.9 years↓
"All creatures get -3/-3 until end of turn."
Soul Snuffers79%
$0.27↓#5038↓0.21↓18.1 years↑
"When this creature enters, put a -1/-1 counter on each creature."
Toxic Deluge78%
$4.49↑#67↑0.87↑12.8 years↑
"All creatures get -X/-X until end of turn."
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$0.17↓#9191↓0.27↓1.2 years↓
"Menace"
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$0.27↓#10402↓0.00↓0.6 years↓
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"Creatures with no counters on them get -2/-2 until end of turn."
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$0.29↓#12436↓0.14↓2.8 years↓
"Menace"