Spectral Arcanist 
Creature — Spirit Wizard
$0.29 #12591 0.42 4.8 years
Flying
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.
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Cards similar to Spectral Arcanist 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.
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."
Diluvian Primordial85%
$0.26↓#3658↑0.4913.6 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."
Goblin Dark-Dwellers84%
$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."
Daring Waverider84%
$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."
Wrexial, the Risen Deep82%
$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."
Chancellor of the Spires82%
$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."
Arcane Heist82%
$2.94↑#5097↑0.362.4 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."
Sorcerous Squall82%
$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 Dragster81%
$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."
Memory Plunder80%
$1.39↑#4684↑0.3818.3 years↑
"You may cast target instant or sorcery card from an opponent's graveyard without paying its mana cost."
Talent of the Telepath80%
$0.65↑#103140.65↑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."
Sphinx of Forgotten Lore80%
$0.36↑#8965↑0.23↓1.8 years↓
"Flying"
Pteramander78%
$0.21↓#16045↓0.00↓7.6 years↑
"Flying"
Drogskol Cavalry78%
$0.38↑#139020.29↓10.4 years↑
"Flying"
Halo Forager78%
$0.27↓#6222↑0.14↓3.4 years↓
"When this creature enters, you may pay 
. When you do, you may cast target instant or sorcery card with mana value X from a graveyard without paying its mana cost. If that spell would be put into a graveyard, exile it instead."
. When you do, you may cast target instant or sorcery card with mana value X from a graveyard without paying its mana cost. If that spell would be put into a graveyard, exile it instead."
Scholar of the Lost Trove77%
$0.29#102820.446.1 years↑
"When this creature enters, you may cast target instant, sorcery, or artifact card from your graveyard without paying its mana cost. If an instant or sorcery spell cast this way would be put into your graveyard, exile it instead."
Diviner of Mist77%
$0.28↓#8659↑0.21↓1.4 years↓
"Whenever this creature attacks, mill four cards. You may cast an instant or sorcery spell from your graveyard with mana value 4 or less without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Efreet Flamepainter77%
$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."
Prescient Chimera77%
$0.06↓#22689↓0.12↓12.9 years↑
"Flying"
Impulsivity76%
$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."