Arvinox, the Mind Flail 
Legendary Enchantment Creature — Horror
$0.40 #4797 0.44 4.9 years
Arvinox isn't a creature unless you control three or more permanents you don't own.
At the beginning of your end step, exile the bottom card of each opponent's library face down. For as long as those cards remain exiled, you may look at them, you may cast permanent spells from among them, and you may spend mana as though it were mana of any color to cast those spells.
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Cards similar to Arvinox, the Mind Flail 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.
Brainstealer Dragon84%
$8.42↑#2207↑0.484.2 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."
Stolen Strategy80%
$0.34↓#45630.65↑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."
Extract Power78%
$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."
Outrageous Robbery76%
$0.38↓#47110.402.6 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."
Uvilda, Dean of Perfection // Nassari, Dean of Expression76%
$0.28↓#16667↓0.465.4 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."
Black Cat, Cunning Thief76%
$0.58↑#6868↓0.64↑1.0 years↓
"When this card enters, look at the top nine cards of target opponent's library, exile two of them face down, then put the rest on the bottom of their library in a random order. You may play the exiled cards for as long as they remain exiled. Mana of any type can be spent to cast spells this way."
Mindleecher75%
$0.42↑#10096↓0.446.4 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."
Gonti, Canny Acquisitor75%
$1.57↑#8111↓0.59↑2.4 years↓
"Whenever one or more creatures you control deal combat damage to a player, look at the top card of that player's library, then exile it face down. You may play that card for as long as it remains exiled, and mana of any type can be spent to cast that spell."
Etali, Primal Storm74%
$0.44↑#266↑0.85↑8.6 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."
Siphon Insight74%
$0.23↓#43240.374.9 years
"Look at the top two cards of target opponent's library. Exile one of them face down and put the other on the bottom of that library. You may play the exiled card for as long as it remains exiled, and you may spend mana as though it were mana of any color to cast that spell."
Ixhel, Scion of Atraxa74%
$0.52↑#5800↓0.59↑3.6 years↓
"At the beginning of your end step, each opponent who has three or more poison counters exiles the top card of their library face down. You may look at and play those cards for as long as they remain exiled, and you may spend mana as though it were mana of any color to cast those spells."
Nathan Drake, Treasure Hunter74%
$4.82↑#14711↓0.00↓0.9 years↓
"Whenever this card attacks, exile the top card of each player's library. You may cast a spell from among those cards."
Mind's Dilation72%
$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."
Gonti, Night Minister72%
$0.79↑#2503↑0.481.6 years↓
"Whenever a creature deals combat damage to one of your opponents, its controller looks at the top card of that opponent's library and exiles it face down. They may play that card for as long as it remains exiled. Mana of any type can be spent to cast a spell this way."
Laughing Jasper Flint72%
$0.37↓#3735↑0.54↑2.4 years↓
"At the beginning of your upkeep, exile the top X cards of target opponent's library, where X is the number of outlaws you control. Until end of turn, you may cast spells from among those cards, and mana of any type can be spent to cast those spells."
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Blightwing Bandit71%
$4.31↑#6132↓0.59↑3.0 years↓
"Whenever you cast your first spell during each opponent's turn, look at the top card of that player's library, then exile it face down. You may play that card for as long as it remains exiled, and mana of any type can be spent to cast it."
Gonti, Lord of Luxury70%
$0.28↓#2046↑0.55↑9.9 years↑
"When this card enters, look at the top four cards of target opponent's library, exile one of them face down, then put the rest on the bottom of that library in a random order. You may cast that card for as long as it remains exiled, and mana of any type can be spent to cast that spell."
Plargg and Nassari70%
$0.30↓#2290↑0.463.3 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."
Fevered Suspicion70%
$2.24↑#55060.485.1 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."
Mezzio Mugger70%
$0.33↓#12858↓0.07↓4.4 years
"Whenever this creature attacks, exile the top card of each player's library. You may play those cards this turn, and you may spend mana as though it were mana of any color to cast those spells."