Brush Off {2}{U}{U}
Instant
This spell costs {1}{U} less to cast if it targets an instant or sorcery spell.
Counter target spell.
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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.
Stormwing Entity 92%
$0.26#17759
"This spell costs {2}{U} less to cast if you've cast an instant or sorcery spell this turn."