Rowdy Research {6}{U}
Instant
This spell costs {1} less to cast for each creature that attacked this turn.
Draw three cards.
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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.
Witchstalker Frenzy 100%
$0.32#14728
"This spell costs {1} less to cast for each creature that attacked this turn."
The Mary Janes 100%
$0.32#22057
"This spell costs {1} less to cast for each creature that attacked this turn."
Search Party Captain 96%
$0.16#18550
"This spell costs {1} less to cast for each creature you attacked with this turn."
Hardened Berserker 83%
$0.03#23580
"Whenever this creature attacks, the next spell you cast this turn costs {1} less to cast."
Fast Forward 80%
$0.36#9862
"This spell costs {1} less to cast for each opponent you attacked this turn."