Sphinx of Forgotten Lore 
Creature — Sphinx
$0.36 #8965 0.23 1.8 years
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 similar to Sphinx of Forgotten Lore 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.
Backdraft Hellkite94%
$0.53↑#80120.147.0 years↑
"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."
Return the Past90%
$0.34↓#92740.43↑2.9 years↑
"During your turn, each instant and sorcery card in your graveyard has flashback. Its flashback cost is equal to its mana cost."
Slickshot Lockpicker90%
$0.25↓#11454↓0.292.4 years
"When this creature enters, target instant or sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost."
Flashback89%
$3.87↑#2153↑0.00↓0.4 years↓
"Target instant or sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost."
Snapcaster Mage88%
$14.63↑#1444↑0.49↑14.9 years↑
"When this creature enters, target instant or sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost."
+1 more matching line
Lier, Disciple of the Drowned88%
$0.96↑#2185↑0.62↑4.9 years↑
"Each instant and sorcery card in your graveyard has flashback. The flashback cost is equal to that card's mana cost."
Archmage's Newt86%
$0.17↓#13455↓0.00↓2.4 years
"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 
until end of turn instead if this creature is saddled."
until end of turn instead if this creature is saddled."
Dralnu, Lich Lord85%
$0.28↓#19828↓0.10↓19.9 years↑
"
: Target instant or sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost."
: Target instant or sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost."
Recoup84%
$0.25↓#13120↓0.2924.9 years↑
"Target sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost."
Past in Flames84%
$2.32↑#1274↑0.46↑14.9 years↑
"Each instant and sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost."
Pteramander84%
$0.21↓#16045↓0.00↓7.6 years↑
"Flying"
Iroh, Grand Lotus82%
$0.45↑#6131↑0.00↓0.8 years↓
"During your turn, each non-Lesson instant and sorcery card in your graveyard has flashback. The flashback cost is equal to that card's mana cost."
Prescient Chimera82%
$0.06↓#22689↓0.12↓12.9 years↑
"Flying"
Katilda and Lier81%
$0.35↓#17259↓0.07↓3.4 years↑
"Whenever you cast a Human spell, target instant or sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost."
Lost in Memories80%
$0.33↓#13127↓0.00↓0.8 years↓
"Enchanted creature gets +1/+1 and has "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.""
+1 more matching line
The Fugitive Doctor79%
$0.26↓#14824↓0.50↑2.9 years↑
"Whenever this card attacks, you may sacrifice a Clue. When you do, target instant or sorcery card in your graveyard gains flashback 
until end of turn."
until end of turn."
Wings of the Guard78%
$0.14↓#23912↓0.2010.0 years↑
"Flying"
Shrieking Specter78%
$1.01↑#30868↓0.47↑27.2 years↑
"Flying"
The Dawning Archaic78%
$1.19↑#85440.00↓0.4 years↓
"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."
Murktide Regent78%
$5.69↑#15085↓1.00↑5.3 years↑
"Flying"