Katilda and Lier 
Legendary Creature — Human
$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. (You may cast that card from your graveyard for its flashback cost. Then exile it.)
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Cards similar to Katilda and Lier 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.
Return the Past82%
$0.34↓#9274↑0.43↑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."
Sphinx of Forgotten Lore81%
$0.36↑#8965↑0.23↑1.8 years↓
"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."
Flashback79%
$3.87↑#2153↑0.000.4 years↓
"Target instant or sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost."
Slickshot Lockpicker79%
$0.25↓#11454↑0.29↑2.4 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."
Snapcaster Mage76%
$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."
Lier, Disciple of the Drowned76%
$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."
Dralnu, Lich Lord76%
$0.28↓#198280.1019.9 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."
Recoup73%
$0.25↓#13120↑0.29↑24.9 years↑
"Target sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost."
Past in Flames73%
$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."
Backdraft Hellkite72%
$0.53↑#8012↑0.147.0 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."
Archmage's Newt72%
$0.17↓#13455↑0.002.4 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."