Jace's Mindseeker 
Creature — Fish Illusion
$0.34 #14644 0.21 13.1 years
Flying
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.
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Cards similar to Jace's Mindseeker 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 Spires90%
$0.44↑#137790.57↑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."
Mindclaw Shaman90%
$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."
Sorcerous Squall88%
$0.80↑#8452↑0.202.8 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."
Talent of the Telepath88%
$0.65↑#10314↑0.65↑11.1 years↓
"Target opponent reveals the top seven cards of their library. You may cast an instant or sorcery spell from among them without paying its mana cost. Then that player puts the rest into their graveyard."
Memory Plunder86%
$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."
Diluvian Primordial85%
$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."
Wrexial, the Risen Deep81%
$1.50↑#5308↑0.47↑16.6 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."
Knacksaw Clique81%
$3.35↑#173380.2018.3 years↑
"Flying"
Dazzling Sphinx80%
$0.37↑#6415↑0.53↑5.4 years↓
"Whenever this creature deals combat damage to a player, that player 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 that player puts the exiled cards that weren't cast this way on the bottom of their library in a random order."
Chaos Wand80%
$0.25↓#4248↑0.278.1 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."
Arcane Heist80%
$2.94↑#5097↑0.36↑2.4 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."
Deluxe Dragster80%
$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."
Gríma, Saruman's Footman79%
$1.60↑#3164↑0.36↑3.2 years↓
"Whenever this card deals combat damage to a player, that player 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 that player puts the exiled cards that weren't cast this way on the bottom of their library in a random order."
Quistis Trepe78%
$0.23↓#9075↑0.241.2 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."
Djinn of Wishes78%
$0.12↓#18716↓0.00↓17.1 years↑
"Flying"
Spectral Arcanist76%
$0.29↓#125910.42↑4.8 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."
Strago and Relm74%
$0.25↓#9122↑0.44↑1.2 years↓
"
, : Target opponent exiles cards from the top of their library until they exile an instant, sorcery, or creature card. You may cast that card without paying its mana cost. If you cast a creature spell this way, it gains haste and "At the beginning of the end step, sacrifice this creature." Activate only as a sorcery."
, : Target opponent exiles cards from the top of their library until they exile an instant, sorcery, or creature card. You may cast that card without paying its mana cost. If you cast a creature spell this way, it gains haste and "At the beginning of the end step, sacrifice this creature." Activate only as a sorcery."
Scarlet Witch, Chaotic Avenger74%
$0.35↑#123650.00↓0.2 years↓
"Flying"
Flotsam // Jetsam72%
$0.14↓#146200.142.6 years↓
"Each opponent mills three cards, then you may cast a spell from each opponent's graveyard without paying its mana cost. If a spell cast this way would be put into a graveyard, exile it instead."
Torrential Gearhulk72%
$0.35↑#2710↑0.51↑9.9 years↓
"When this creature enters, you may cast target instant card from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."