Depower {2}{U}
Instant
This spell costs {2} less to cast if it targets an attacking creature.
Target creature gets -4/-0 until end of turn.
Draw a card.
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Cards that do something similar 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.
Bury in Books 100%
$0.17#20825
"This spell costs {2} less to cast if it targets an attacking creature."
Ephara's Dispersal 100%
$0.31#10728
"This spell costs {2} less to cast if it targets an attacking creature."
Code of Constraint 100%
$0.08#26344
"Target creature gets -4/-0 until end of turn."
+1 more matching line
Obyra's Attendants // Desperate Parry 100%
$0.12#18898
"Target creature gets -4/-0 until end of turn."
Stream of Unconsciousness 99%
$0.22#18572
"Target creature gets -4/-0 until end of turn. If you control a Wizard, draw a card."