Mirari {5}
Legendary Artifact
Whenever you cast an instant or sorcery spell, you may pay {3}. If you do, copy that spell. You may choose new targets for the copy.
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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.
Wandering Archaic // Explore the Vastlands 90%
$9.88#1250
"Whenever an opponent casts an instant or sorcery spell, they may pay {2}. If they don't, you may copy that spell. You may choose new targets for the copy."
Cloven Casting 87%
$0.26#21935
"Whenever you cast a multicolored instant or sorcery spell, you may pay {1}. If you do, copy that spell. You may choose new targets for the copy."
Eyes of the Watcher 87%
$0.35#21751
"Whenever you cast an instant or sorcery spell, you may pay {1}. If you do, scry 2."
Reflective Golem 84%
$0.10#23613
"Whenever you cast an instant or sorcery spell that targets only this creature, you may pay {2}. If you do, copy that spell. You may choose new targets for the copy."
Unbound Flourishing 83%
$2.17#2696
"Whenever you cast an instant or sorcery spell or activate an ability, if that spell's mana cost or that ability's activation cost contains {X}, copy that spell or ability. You may choose new targets for the copy."
Festival of Embers 83%
$0.24#11114
"During your turn, you may cast instant and sorcery spells from your graveyard by paying 1 life in addition to their other costs."
Mage Duel 82%
$0.10#21489
"This spell costs {2} less to cast if you've cast another instant or sorcery spell this turn."
Riku of Two Reflections 82%
$6.53#11839
"Whenever you cast an instant or sorcery spell, you may pay {U}{R}. If you do, copy that spell. You may choose new targets for the copy."