Diluvian Primordial 
Creature — Avatar
$0.26 #3658 0.49 13.6 years
Flying
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.
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Cards similar to Diluvian Primordial 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 Heist94%
$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."
Wrexial, the Risen Deep92%
$1.50↑#5308↓0.4716.6 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."
Memory Plunder92%
$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."
Chancellor of the Spires92%
$0.44↑#13779↓0.5715.3 years↑
"When this creature enters, you may cast target instant or sorcery card from an opponent's graveyard without paying its mana cost."
Sorcerous Squall90%
$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↓0.523.4 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."
Quistis Trepe90%
$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."
Dire Fleet Daredevil88%
$0.22↓#32370.24↓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."
Mindclaw Shaman86%
$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."
Spectral Arcanist85%
$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."
Jace's Mindseeker85%
$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."
Flawless Forgery83%
$0.29↑#17455↓0.564.4 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."
Impulsivity82%
$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."
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."
Tasha, the Witch Queen82%
$5.66↑#4448↓0.494.2 years↓
"+1: Draw a card. For each opponent, exile up to one target instant or sorcery card from that player's graveyard and put a page counter on it."
Flotsam // Jetsam82%
$0.14↓#14620↓0.14↓2.6 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."
Goblin Dark-Dwellers80%
$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."
Summon: Esper Valigarmanda79%
$0.24↓#5316↓0.27↓1.2 years↓
"Exile an instant or sorcery card from each graveyard."
Daring Waverider78%
$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."
Torrential Gearhulk78%
$0.35↑#2710↑0.519.9 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."