Sphinx of Forgotten Lore 


Creature — Sphinx
Flash (You may cast this spell any time you could cast an instant.)
Flying
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. (You may cast that card from your graveyard for its flashback cost. Then exile it.)
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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 89%
$0.23#18759
"Whenever this creature attacks, instant and sorcery spells you cast this turn cost {1} less to cast."
Maelstrom Muse 88%
$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."
Dreadhorde Arcanist 87%
$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."
Archmage's Newt 86%
$0.18#13172
"Whenever this creature deals combat damage to a player, target instant or sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost. That card gains flashback {0} until end of turn instead if this creature is saddled."
Surtland Elementalist 84%
$0.24#16853
"Whenever this creature attacks, you may cast an instant or sorcery spell from your hand without paying its 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."
The Dawning Archaic 83%
$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."
Ardent Dustspeaker 83%
$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."
Bloodfire Enforcers 83%
$0.07#27407
"This creature has first strike and trample as long as an instant card and a sorcery card are in your graveyard."
Wildfire Eternal 82%
$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."
Jeleva, Nephalia's Scourge 81%
$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."