Jeleva, Nephalia's Scourge {1}{U}{B}{R}
Legendary Creature — Vampire Wizard
Flying
When Jeleva enters, each player exiles the top X cards of their library, where X is the amount of mana spent to cast Jeleva.
Whenever Jeleva attacks, you may cast an instant or sorcery spell from among cards exiled with Jeleva without paying its mana cost.
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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.
The Dawning Archaic 95%
$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."
Etali, Primal Conqueror // Etali, Primal Sickness 89%
$33.36#777
"When this card enters, each player exiles cards from the top of their library until they exile a nonland card. You may cast any number of spells from among the nonland cards exiled this way without paying their mana costs."
Kylox's Voltstrider 86%
$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."
Ardent Dustspeaker 85%
$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."
Howl of the Horde 85%
$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."
Maelstrom Muse 84%
$0.15#21417
"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."
Helmut Zemo, Mastermind 83%
$0.24#21031
"Whenever this card attacks, you may cast target instant or sorcery card with mana value less than or equal to his power from your graveyard. If that spell would be put into your graveyard, exile it instead. If you cast a spell this way, put a +1/+1 counter on this card."
Spellbinding Soprano 83%
$0.23#18759
"Whenever this creature attacks, instant and sorcery spells you cast this turn cost {1} less to cast."
Dreadhorde Arcanist 82%
$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."
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."
Sphinx of Forgotten Lore 81%
$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."
The Fugitive Doctor 81%
$0.21#14465
"Whenever this card attacks, you may sacrifice a Clue. When you do, target instant or sorcery card in your graveyard gains flashback {2}{R}{G} until end of turn."
Wrexial, the Risen Deep 81%
$1.87#5216
"Whenever this card deals combat damage to a player, you may cast target instant or sorcery card from that player's graveyard without paying its mana cost. If that spell would be put into a graveyard, exile it instead."
Wildfire Eternal 80%
$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."
Surtland Elementalist 80%
$0.24#16853
"Whenever this creature attacks, you may cast an instant or sorcery spell from your hand without paying its mana cost."