Thief of Sanity {1}{U}{B}
Creature — Specter
Flying
Whenever this creature deals combat damage to a player, look at the top three cards of that player's library, exile one of them face down, then put the rest into their graveyard. You may cast that card for as long as it remains exiled, and mana of any type can be spent to cast that 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.
Bismuth Mindrender 87%
$0.32#7054
"Whenever this creature deals combat damage to a player, that player exiles cards from the top of their library until they exile a nonland card. You may cast that card by paying life equal to the spell's mana value rather than paying its mana cost."
Fallen Shinobi 86%
$7.77#2020
"Whenever this creature deals combat damage to a player, that player exiles the top two cards of their library. Until end of turn, you may play those cards without paying their mana costs."
Scarlet Witch, Chaotic Avenger 86%
$2.61#15105
"Whenever this card deals combat damage to a player, look at the top two cards of your library, then exile them face down. Then you may cast a Hero or noncreature spell from among cards exiled with this card without paying its mana cost."
Scalpelexis 85%
$0.28#28234
"Whenever this creature deals combat damage to a player, that player exiles the top four cards of their library. If two or more of those cards have the same name, repeat this process."
Dream Pillager 83%
$0.18#12284
"Whenever this creature deals combat damage to a player, exile that many cards from the top of your library. Until end of turn, you may cast spells from among those exiled cards."
Raven Guild Master 83%
$1.04#22296
"Whenever this creature deals combat damage to a player, that player exiles the top ten cards of their library."