Arcane Subtraction 

Instant
$0.07 #25630 0.33 5.5 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 Scrutiny90%
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"Target creature gets -4/-0 until end of turn."
+1 more matching line
Befuddle88%
$0.04↓#219780.07↓8.5 years↑
"Target creature gets -4/-0 until end of turn."
+1 more matching line
Bewilder88%
$0.04↓#268920.11↓20.0 years↑
"Target creature gets -3/-0 until end of turn."
+1 more matching line
Shocking Grasp88%
$0.10↑#229030.00↓5.2 years
"Target creature gets -2/-0 until end of turn."
+1 more matching line
Fleeting Distraction88%
$0.08↑#9059↑0.15↓16.5 years↑
"Target creature gets -1/-0 until end of turn."
+1 more matching line