Arcane Heist 
Sorcery
$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.
Cipher (Then you may exile this spell card encoded on a creature you control. Whenever that creature deals combat damage to a player, its controller may cast a copy of the encoded card without paying its mana cost.)
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Cards similar to Arcane Heist 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.
Memory Plunder94%
$1.39↓#46840.3818.3 years↑
"You may cast target instant or sorcery card from an opponent's graveyard without paying its mana cost."
Diluvian Primordial94%
$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 Deep93%
$1.50↓#53080.47↑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."
Sorcerous Squall92%
$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 Dragster91%
$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."
Shadow Slice90%
$0.04↓#22576↓0.48↑13.6 years↑
"Cipher"
Call of the Nightwing89%
$0.13↓#17169↓0.18↓13.6 years↑
"Cipher"
Writ of Return89%
$0.39↓#11408↓0.11↓4.4 years↑
"Cipher"
Chancellor of the Spires88%
$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."
Paranoid Delusions88%
$0.14↓#16422↓0.59↑13.6 years↑
"Cipher"
Quistis Trepe88%
$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."
Hands of Binding87%
$0.19↓#15580↓0.3313.6 years↑
"Cipher"
Midnight Recovery86%
$0.13↓#19071↓0.3113.6 years↑
"Cipher"
Flawless Forgery84%
$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."
Dire Fleet Daredevil84%
$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."
Mental Vapors84%
$0.06↓#22893↓0.80↑13.6 years↑
"Cipher"
Last Thoughts84%
$0.18↓#17191↓0.06↓13.6 years↑
"Cipher"
Voidwalk84%
$0.22↓#13753↓0.20↓13.6 years↑
"Cipher"
Trait Doctoring84%
$0.34↓#13440↓0.3613.3 years↑
"Cipher"
Stolen Identity84%
$0.33↓#47490.11↓13.6 years↑
"Cipher"