Memory Plunder {U/B}{U/B}{U/B}{U/B}
Instant
You may cast target instant or sorcery card from an opponent's graveyard without paying its mana cost.
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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.
Arcane Heist 98%
$3.84#5063
"You may cast target instant or sorcery card from an opponent's graveyard without paying its mana cost. If that spell would be put into their graveyard, exile it instead."
Sins of the Past 87%
$0.42#22368
"Until end of turn, 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. Exile this card."
Katilda and Lier 86%
$0.39#16866
"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."
Wrexial, the Risen Deep 85%
$1.87#5216
"Whenever this card deals combat damage to a player, you may cast target instant or sorcery card from that player's graveyard without paying its mana cost. If that spell would be put into a graveyard, exile it instead."
Lier, Disciple of the Drowned 84%
$0.43#2209
"Each instant and sorcery card in your graveyard has flashback. The flashback cost is equal to that card's mana cost."
Overmaster 84%
$2.99#3095
"The next instant or sorcery spell you cast this turn can't be countered."
Harness the Storm 84%
$0.30#16961
"Whenever you cast an instant or sorcery spell from your hand, you may cast target card with the same name as that spell from your graveyard."
Gale, Waterdeep Prodigy 83%
$0.48#5161
"Whenever you cast an instant or sorcery spell from your hand, you may cast up to one target card of the other type from your graveyard. If a spell cast from your graveyard this way would be put into your graveyard, exile it instead."
Flashback 83%
$3.87#2830
"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 Flames 82%
$4.21#1265
"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 82%
$1.22#9492
"This spell costs {1} less to cast for each instant and sorcery card in your graveyard."
The Magic Mirror 82%
$3.66#4945
"This spell costs {1} less to cast for each instant and sorcery card in your graveyard."
Furygale Flocking 82%
$0.22#11473
"This spell costs {1} less to cast for each instant and sorcery card in your graveyard."
Eddymurk Crab 82%
$1.51#13043
"This spell costs {1} less to cast for each instant and sorcery card in your graveyard."
Cryptic Serpent 82%
$1.02#17170
"This spell costs {1} less to cast for each instant and sorcery card in your graveyard."
Bedlam Reveler 82%
$0.22#13672
"This spell costs {1} less to cast for each instant and sorcery card in your graveyard."
Tolarian Terror 82%
$0.21#10625
"This spell costs {1} less to cast for each instant and sorcery card in your graveyard."
Niv-Mizzet, Supreme 82%
$0.36#13141
"Each instant and sorcery card in your graveyard that's exactly two colors has jump-start."
Suffocation 81%
$0.15#31137
"Cast this spell only if you were dealt damage this turn by a red instant or sorcery spell."
Taigam, Ojutai Master 81%
$1.00#9267
"Whenever you cast an instant or sorcery spell from your hand, if this card attacked this turn, that spell gains rebound."