Diviner of Mist 

Creature — Dragon
$0.28 #8659 0.21 1.4 years
Flying
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.
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Cards similar to Diviner of Mist 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.
Daring Waverider91%
$0.24↓#88810.38↑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."
Goblin Dark-Dwellers91%
$0.26↓#89450.00↓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."
Dreadhorde Arcanist88%
$0.39↑#79750.117.3 years↑
"Whenever this creature attacks, you may cast target instant or sorcery card with mana value less than or equal to this creature's power from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Seifer Almasy88%
$0.29↑#10537↓0.181.2 years
"Whenever this card deals combat damage to a player, 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."
Efreet Flamepainter86%
$0.33↑#15409↓0.135.4 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."
The Dawning Archaic86%
$1.19↑#85440.00↓0.4 years↓
"Whenever this card attacks, 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."
Helmut Zemo, Mastermind86%
$0.23↓#18432↓0.00↓0.2 years↓
"Whenever this card attacks, you may cast target instant or sorcery card with mana value less than or equal to his power from your graveyard. If that spell would be put into your graveyard, exile it instead. If you cast a spell this way, put a +1/+1 counter on this card."
Ogre Battlecaster86%
$0.22↓#24630↓0.69↑3.8 years↑
"Whenever this creature attacks, you may cast target instant or sorcery card from your graveyard by paying 
in addition to its other costs. If that spell would be put into a graveyard, exile it instead. When you cast that spell, this creature gets +X/+0 until end of turn, where X is that spell's mana value."
Kess, Dissident Mage86%
$3.80↑#3135↑0.55↑9.0 years↑
"Once during each of your turns, you may cast an instant or sorcery spell from your graveyard. If a spell cast this way would be put into your graveyard, exile it instead."
Mavinda, Students' Advocate84%
$0.52↑#103080.50↑5.4 years↑
"
: You may cast target instant or sorcery card from your graveyard this turn. If that spell doesn't target a creature you control, it costs
more to cast this way. If that spell would be put into your graveyard, exile it instead. Activate only once each turn."
Sins of the Past83%
$0.42↑#22614↓0.38↑20.9 years↑
"Until end of turn, 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. Exile this card."
Torrential Gearhulk82%
$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."
Victor Timely, Wily Tycoon82%
$0.26↓#27392↓0.00↓0.2 years↓
"When this card enters, you may cast target artifact, 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."
Scholar of the Lost Trove82%
$0.29↑#102820.44↑6.1 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."
Invoke Calamity82%
$0.49↑#4098↑0.08↓4.5 years↑
"You may cast up to two instant and/or sorcery spells with total mana value 6 or less from your graveyard and/or hand without paying their mana costs. If those spells would be put into your graveyard, exile them instead. Exile this card."
Wishing Well80%
$0.22↓#11064↓0.252.1 years
"
: Put a coin counter on this artifact. When you do, you may cast target instant or sorcery card with mana value equal to the number of coin counters on this artifact from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead. Activate only as a sorcery."
Chandra, Acolyte of Flame80%
$0.48↑#5957↑0.07↓7.2 years↑
"−2: You may cast target instant or sorcery card with mana value 3 or less from your graveyard. If that spell would be put into your graveyard, exile it instead."
Bilbo, Thief in the Night80%
$13.52↑#12851↓0.00↓0.1 years↓
"Whenever this card attacks, you may cast an artifact, instant, or sorcery spell from your graveyard. If an instant or sorcery spell cast this way would be put into your graveyard, exile it instead."