Maelstrom Muse {1}{U}{U/R}{R}
Creature — Djinn Wizard
Flying
Whenever this creature attacks, the next instant or sorcery spell you cast this turn costs {X} less to cast, where X is this creature's power as this ability resolves.
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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.
Spellbinding Soprano 96%
$0.23#18759
"Whenever this creature attacks, instant and sorcery spells you cast this turn cost {1} less to cast."
Dreadhorde Arcanist 90%
$0.63#7861
"Whenever this creature attacks, you may cast target instant or sorcery card with mana value less than or equal to this creature's power from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Surtland Elementalist 89%
$0.24#16853
"Whenever this creature attacks, you may cast an instant or sorcery spell from your hand without paying its mana cost."
Wildfire Eternal 89%
$0.25#16268
"Whenever this creature attacks and isn't blocked, you may cast an instant or sorcery spell from your hand without paying its mana cost."
Sphinx of Forgotten Lore 88%
$0.42#9023
"Whenever this creature attacks, target instant or sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to that card's mana cost."
Backdraft Hellkite 84%
$0.50#7923
"Whenever this creature attacks, each instant and sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost."
Ardent Dustspeaker 84%
$0.08#20906
"Whenever this creature attacks, you may put an instant or sorcery card from your graveyard on the bottom of your library. If you do, exile the top two cards of your library. You may play those cards this turn."
Jeleva, Nephalia's Scourge 84%
$1.90#14126
"Whenever this card attacks, you may cast an instant or sorcery spell from among cards exiled with this card without paying its mana cost."
Howl of the Horde 83%
$0.24#13504
"If you attacked this turn, when you next cast an instant or sorcery spell this turn, copy that spell an additional time. You may choose new targets for the copy."
Smoldering Stagecoach 82%
$0.37#15337
"Whenever this Vehicle attacks, the next instant spell and the next sorcery spell you cast this turn each have cascade."
Tzaangor Shaman 82%
$0.36#14940
"Whenever this creature deals combat damage to a player, copy the next instant or sorcery spell you cast this turn when you cast it. You may choose new targets for the copy."
Bloodfire Enforcers 82%
$0.07#27407
"This creature has first strike and trample as long as an instant card and a sorcery card are in your graveyard."
Kylox's Voltstrider 80%
$0.21#22218
"Whenever this Vehicle attacks, you may cast an instant or sorcery spell from among cards exiled with it. If that spell would be put into a graveyard, put it on the bottom of its owner's library instead."
Haunting Figment 80%
$0.08#24057
"This creature can't be blocked as long as you've cast an instant or sorcery spell this turn."
The Dawning Archaic 80%
$1.22#9492
"Whenever this card attacks, you may cast target instant or sorcery card from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Stormsplitter 80%
$2.81#3865
"Whenever you cast an instant or sorcery spell, create a token that's a copy of this creature. Exile that token at the beginning of the next end step."