Ricochet Trap 

Instant — Trap
If an opponent cast a blue spell this turn, you may pay {R} rather than pay this spell's mana cost.
Change the target of target spell with a single target.
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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.
Imp's Mischief 99%
$6.66#686
"Change the target of target spell with a single target. You lose life equal to that spell's mana value."
Divert 87%
$2.45#19881
"Change the target of target spell with a single target unless that spell's controller pays {2}."