Arcane Subtraction 

Instant
$0.07 #25556 0.20 5.4 years
Target creature gets -4/-0 until end of turn.
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Cards similar to Arcane Subtraction 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.
Jace's Scrutiny91%
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"Target creature gets -4/-0 until end of turn."
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Befuddle88%
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"Target creature gets -4/-0 until end of turn."
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Bewilder88%
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"Target creature gets -3/-0 until end of turn."
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Shocking Grasp88%
$0.05↓#226540.195.1 years
"Target creature gets -2/-0 until end of turn."
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Fleeting Distraction88%
$0.07#9052↑0.2116.4 years↑
"Target creature gets -1/-0 until end of turn."
+1 more matching line