Snapcaster Mage 
Creature — Human Wizard
$14.63 #1444 0.49 14.9 years
Flash
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. (You may cast that card from your graveyard for its flashback cost. Then exile it.)
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Cards similar to Snapcaster Mage 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.
Slickshot Lockpicker95%
$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."
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."
Sphinx of Forgotten Lore88%
$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."
Return the Past88%
$0.34↓#9274↓0.432.9 years↓
"During your turn, each instant and sorcery card in your graveyard has flashback. Its flashback cost is equal to its mana cost."
Lier, Disciple of the Drowned84%
$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."
Recoup83%
$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."
Archmage's Newt82%
$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 Lord81%
$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."
Past in Flames81%
$2.32↓#12740.4614.9 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 Hellkite80%
$0.53↓#8012↓0.14↓7.0 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."
Katilda and Lier76%
$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."
Iroh, Grand Lotus75%
$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."
Lost in Memories75%
$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
Songcrafter Mage74%
$0.25↓#12867↓0.20↓1.4 years↓
"When this creature enters, target instant or sorcery card in your graveyard gains harmonize until end of turn. Its harmonize cost is equal to its mana cost."
+1 more matching line
Will of the Jeskai74%
$5.10↓#2216↓0.31↓1.4 years↓
"• Each instant and sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost."
Daring Waverider72%
$0.24↓#8881↓0.38↓2.1 years↓
"When this creature enters, you may cast target instant or sorcery card with mana value 4 or less from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Goblin Dark-Dwellers71%
$0.26↓#8945↓0.00↓10.6 years↓
"When this creature enters, you may cast target instant or sorcery card with mana value 3 or less from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Festival of Embers70%
$0.26↓#11541↓0.402.1 years↓
"During your turn, you may cast instant and sorcery spells from your graveyard by paying 1 life in addition to their other costs."