Mind's Dilation 
Enchantment
$0.40 #2656 0.76 10.1 years
Whenever an opponent casts their first spell each turn, that player exiles the top card of their library. If it's a nonland card, you may cast it without paying its mana cost.
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Cards similar to Mind's Dilation 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.
Etali, Primal Storm91%
$0.44↑#266↑0.858.6 years↓
"Whenever this card attacks, exile the top card of each player's library, then you may cast any number of spells from among those cards without paying their mana costs."
Stolen Goods88%
$0.25↓#9128↓0.92↑14.3 years↑
"Target opponent exiles cards from the top of their library until they exile a nonland card. Until end of turn, you may cast that card without paying its mana cost."
Stolen Strategy88%
$0.34↓#4563↓0.65↓8.2 years↓
"At the beginning of your upkeep, exile the top card of each opponent's library. Until end of turn, you may cast spells from among those exiled cards, and you may spend mana as though it were mana of any color to cast those spells."
Villainous Wealth88%
$0.29↓#24060.63↓11.9 years↑
"Target opponent exiles the top X cards of their library. You may cast any number of spells with mana value X or less from among them without paying their mana costs."
Fevered Suspicion87%
$2.24↑#5506↓0.48↓5.1 years↓
"Each opponent exiles cards from the top of their library until they exile a nonland card. You may cast any number of spells from among those nonland cards without paying their mana costs."
Dream Harvest86%
$0.38↓#6462↓0.00↓0.6 years↓
"Each opponent exiles cards from the top of their library until they have exiled cards with total mana value 5 or greater this way. Until end of turn, you may cast cards exiled this way without paying their mana costs."
Ornate Kanzashi86%
$0.34↓#26616↓0.05↓21.6 years↑
"
, 
: Target opponent exiles the top card of their library. You may play that card this turn."
, : Target opponent exiles the top card of their library. You may play that card this turn."
Rashmi and Ragavan85%
$0.44↑#10067↓0.65↓3.4 years↓
"Whenever you cast your first spell during each of your turns, exile the top card of target opponent's library and create a Treasure token. Then you may cast the exiled card without paying its mana cost if it's a spell with mana value less than the number of artifacts you control. If you don't cast it this way, you may cast it this turn."
Court of Locthwain84%
$5.56↑#3344↓0.40↓3.0 years↓
"At the beginning of your upkeep, exile the top card of target opponent's library. You may play that card for as long as it remains exiled, and mana of any type can be spent to cast it. If you're the monarch, until end of turn, you may cast a spell from among cards exiled with this enchantment without paying its mana cost."
Knacksaw Clique84%
$3.35↑#17338↓0.20↓18.3 years↑
"
, 
: Target opponent exiles the top card of their library. Until end of turn, you may play that card."
, : Target opponent exiles the top card of their library. Until end of turn, you may play that card."
Mindleecher84%
$0.42↑#10096↓0.44↓6.4 years↓
"Whenever this creature mutates, exile the top card of each opponent's library face down. You may look at and play those cards for as long as they remain exiled."
Outrageous Robbery84%
$0.38↓#4711↓0.40↓2.6 years↓
"Target opponent exiles the top X cards of their library face down. You may look at and play those cards for as long as they remain exiled. If you cast a spell this way, you may spend mana as though it were mana of any type to cast it."
Gix, Yawgmoth Praetor84%
$0.49↑#1999↑0.53↓3.8 years↓
"
, Discard X cards: Exile the top X cards of target opponent's library. You may play lands and cast spells from among cards exiled this way without paying their mana costs."
, Discard X cards: Exile the top X cards of target opponent's library. You may play lands and cast spells from among cards exiled this way without paying their mana costs."
Brainstealer Dragon83%
$8.42↑#22070.48↓4.2 years↓
"At the beginning of your end step, exile the top card of each opponent's library. You may play those cards for as long as they remain exiled. If you cast a spell this way, you may spend mana as though it were mana of any color to cast it."
Plargg and Nassari83%
$0.30↓#22900.46↓3.3 years↓
"At the beginning of your upkeep, each player exiles cards from the top of their library until they exile a nonland card. An opponent chooses a nonland card exiled this way. You may cast up to two spells from among the other cards exiled this way without paying their mana costs."
Kotis, the Fangkeeper83%
$0.36↓#5349↓0.841.4 years↓
"Whenever this card deals combat damage to a player, exile the top X cards of their library, where X is the amount of damage dealt. You may cast any number of spells with mana value X or less from among them without paying their mana costs."
Uvilda, Dean of Perfection // Nassari, Dean of Expression82%
$0.28↓#16667↓0.46↓5.4 years↓
"At the beginning of your upkeep, exile the top card of each opponent's library. Until end of turn, you may cast spells from among those exiled cards, and you may spend mana as though it were mana of any color to cast those spells."
Nicol Bolas, God-Pharaoh82%
$3.09↑#5829↓0.91↑9.1 years
"+2: Target opponent exiles cards from the top of their library until they exile a nonland card. Until end of turn, you may cast that card without paying its mana cost."
Bismuth Mindrender82%
$0.36↓#7309↓0.65↓2.2 years↓
"Whenever this creature deals combat damage to a player, that player exiles cards from the top of their library until they exile a nonland card. You may cast that card by paying life equal to the spell's mana value rather than paying its mana cost."
Extract Power82%
$0.31↓#16410↓0.00↓0.2 years↓
"Look at the top card of each player's library, then exile those cards face down. You may play them without paying their mana costs for as long as they remain exiled."