Brainstealer Dragon 
Creature — Dragon Horror
$8.42 #2207 0.48 4.2 years
Flying
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.
Whenever a nonland permanent an opponent owns enters the battlefield under your control, they lose life equal to its mana value.
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Cards similar to Brainstealer Dragon 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.
Stolen Strategy92%
$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."
Outrageous Robbery88%
$0.38↓#4711↓0.402.6 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."
Knacksaw Clique88%
$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."+1 more matching line
Etali, Primal Storm86%
$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."
The Ruinous Powers86%
$1.58↓#7986↓0.75↑3.9 years
"At the beginning of your upkeep, choose an opponent at random. Exile the top card of that player's library. Until end of turn, you may play that card and you may spend mana as though it were mana of any color to cast it. When you cast a spell this way, its owner loses life equal to its mana value."
Mindleecher86%
$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."
Uvilda, Dean of Perfection // Nassari, Dean of Expression86%
$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."
Mezzio Mugger85%
$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."
Ornate Kanzashi85%
$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."
Nathan Drake, Treasure Hunter85%
$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."
Arvinox, the Mind Flail84%
$0.40↓#4797↓0.444.9 years
"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."
Triple Triad84%
$0.37↓#4995↓0.501.2 years↓
"At the beginning of your upkeep, each player exiles the top card of their library. Until end of turn, you may play the card you own exiled this way and each other card exiled this way with lesser mana value than it without paying their mana costs."
You Find Some Prisoners84%
$0.18↓#4434↓0.21↓5.1 years
"• Interrogate Them — Exile the top three cards of target opponent's library. Choose one of them. Until the end of your next turn, you may play that card, and you may spend mana as though it were mana of any color to cast it."
Dream Harvest84%
$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."
Ixhel, Scion of Atraxa84%
$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."
Mind's Dilation83%
$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."
Blightwing Bandit82%
$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."
Court of Locthwain82%
$5.56↓#3344↓0.403.0 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."
Fevered Suspicion82%
$2.24↓#5506↓0.485.1 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."
Villainous Wealth82%
$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."