Memory Plunder 
Instant
$1.39 #4684 0.38 18.3 years
You may cast target instant or sorcery card from an opponent's graveyard without paying its mana cost.
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Cards similar to Memory Plunder 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.
Chancellor of the Spires94%
$0.44↓#13779↓0.57↑15.3 years↓
"When this creature enters, you may cast target instant or sorcery card from an opponent's graveyard without paying its mana cost."
Arcane Heist94%
$2.94↑#50970.362.4 years↓
"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."
Wrexial, the Risen Deep92%
$1.50↑#53080.4716.6 years↓
"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."
Diluvian Primordial92%
$0.26↓#3658↑0.49↑13.6 years↓
"When this creature enters, for each opponent, you may cast up to one target instant or sorcery card from that player's graveyard without paying its mana cost. If a spell cast this way would be put into a graveyard, exile it instead."
Sorcerous Squall91%
$0.80↓#8452↓0.20↓2.8 years↓
"Target opponent mills nine cards, then you may cast an instant or sorcery spell from that player's graveyard without paying its mana cost. If that spell would be put into a graveyard, exile it instead."
Deluxe Dragster90%
$2.35↑#7020↓0.52↑3.4 years↓
"Whenever this Vehicle 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."
Mindclaw Shaman88%
$0.29↓#11570↓0.08↓14.1 years↓
"When this creature enters, target opponent reveals their hand. You may cast an instant or sorcery spell from among those cards without paying its mana cost."
Flawless Forgery87%
$0.29↓#17455↓0.56↑4.4 years↓
"Exile target instant or sorcery card from an opponent's graveyard. Copy that card. You may cast the copy without paying its mana cost."
Jace's Mindseeker86%
$0.34↓#14644↓0.21↓13.1 years↓
"When this creature enters, target opponent mills five cards. You may cast an instant or sorcery spell from among them without paying its mana cost."
Quistis Trepe84%
$0.23↓#9075↓0.24↓1.2 years↓
"When this card enters, you may cast target instant or sorcery card from a graveyard, and mana of any type can be spent to cast that spell. If that spell would be put into a graveyard, exile it instead."
Talent of the Telepath83%
$0.65↓#10314↓0.65↑11.1 years↓
"If there are two or more instant and/or sorcery cards in your graveyard, you may cast up to two instant and/or sorcery spells from among the revealed cards instead of one."
Dire Fleet Daredevil82%
$0.22↓#3237↑0.24↓8.6 years↓
"When this creature enters, exile target instant or sorcery card from an opponent's graveyard. You may cast it this turn, and mana of any type can be spent to cast that spell. If that spell would be put into a graveyard, exile it instead."
Spelltwine82%
$0.30↓#7742↓0.20↓14.1 years↓
"Exile target instant or sorcery card from your graveyard and target instant or sorcery card from an opponent's graveyard. Copy those cards. Cast the copies if able without paying their mana costs. Exile this card."
Mnemonic Deluge80%
$7.64↑#37660.52↑5.8 years↓
"Exile target instant or sorcery card from a graveyard. Copy that card three times. You may cast the copies without paying their mana costs. Exile this card."
Spectral Arcanist80%
$0.29↓#12591↓0.424.8 years↓
"When this creature enters, you may cast an instant or sorcery spell with mana value less than or equal to the number of Spirits you control from a graveyard without paying its mana cost. If that spell would be put into a graveyard, exile it instead."
Efreet Flamepainter78%
$0.33↓#15409↓0.13↓5.4 years↓
"Whenever this creature deals combat damage to a player, 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."
Chaos Wand78%
$0.25↓#42480.27↓8.1 years↓
"
, 
: Target opponent exiles cards from the top of their library until they exile an instant or sorcery card. You may cast that card without paying its mana cost. Then put the exiled cards that weren't cast this way on the bottom of that library in a random order."
, : Target opponent exiles cards from the top of their library until they exile an instant or sorcery card. You may cast that card without paying its mana cost. Then put the exiled cards that weren't cast this way on the bottom of that library in a random order."
Impulsivity77%
$0.27↓#6081↓0.00↓0.6 years↓
"When this creature enters, you may cast target instant or sorcery card from a graveyard without paying its mana cost. If that spell would be put into a graveyard, exile it instead."
Summon: Esper Valigarmanda76%
$0.24↓#53160.27↓1.2 years↓
"Exile an instant or sorcery card from each graveyard."
Daring Waverider76%
$0.24↓#8881↓0.382.1 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."