The Ruinous Powers 
Enchantment
$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.
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Cards similar to The Ruinous Powers 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 Dragon86%
$8.42↑#2207↑0.48↓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."
Inside Information83%
$2.87↑#14825↓0.00↓0.1 years↓
"Exile the top X cards of target opponent's library. You may play those cards this turn. If you cast a spell this way, pay life equal to its mana value rather than pay its mana cost."
Stolen Strategy83%
$0.34↓#4563↑0.658.2 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."
You Find Some Prisoners82%
$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."
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."
Outrageous Robbery82%
$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."
Xander's Pact81%
$0.30↓#16584↓0.19↓4.4 years
"Each opponent exiles the top card of their library. You may cast spells from among those cards this turn. If you cast a spell this way, pay life equal to that spell's mana value rather than pay its mana cost."
Knacksaw Clique81%
$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."
Villainous Wealth80%
$0.29↓#2406↑0.63↓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."
Triple Triad80%
$0.37↓#4995↑0.50↓1.2 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."
Ensnared by the Mara80%
$7.61↑#3385↑0.48↓2.9 years↓
"Each opponent faces a villainous choice — They exile cards from the top of their library until they exile a nonland card, then you may cast that card without paying its mana cost, or that player exiles the top four cards of their library and this card deals damage equal to the total mana value of those exiled cards to that player."
Share the Spoils80%
$3.53↑#5421↑0.48↓5.1 years↑
"During each player's turn, that player may play a land or cast a spell from among cards exiled with this enchantment, and they may spend mana as though it were mana of any color to cast that spell. When they do, exile the top card of their library."
Dream Harvest80%
$0.38↓#64620.00↓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 Kanzashi80%
$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."
Uvilda, Dean of Perfection // Nassari, Dean of Expression79%
$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."
Etali, Primal Storm78%
$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."
Court of Locthwain78%
$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."
Mezzio Mugger78%
$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."
Daxos of Meletis78%
$0.21↓#10152↓0.13↓12.9 years↑
"Whenever Daxos deals combat damage to a player, exile the top card of that player's library. You gain life equal to that card's mana value. Until end of turn, you may cast that card and you may spend mana as though it were mana of any color to cast that spell."
Stolen Goods78%
$0.25↓#91280.92↑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."