Extract Power 
Sorcery
$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.
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Cards similar to Extract Power expected a card that isn't here?
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Lobelia, Defender of Bag End86%
$0.28↓#7238↑0.54↑3.2 years↑
"When this card enters, look at the top card of each opponent's library and exile those cards face down."
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."
Dream Harvest86%
$0.38↑#6462↑0.000.6 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."
Black Cat, Cunning Thief86%
$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."
Mindleecher85%
$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."
Fevered Suspicion84%
$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."
Villainous Wealth84%
$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."
Stolen Strategy82%
$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."
Triple Triad82%
$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."
Stolen Goods82%
$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."
Mind's Dilation82%
$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."
Siphon Insight80%
$0.23↓#4324↑0.37↑4.9 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."
Fire Lord Ozai80%
$1.02↑#10036↑0.000.8 years
"
: Exile the top card of each opponent's library. Until end of turn, you may play one of those cards without paying its mana cost."
: Exile the top card of each opponent's library. Until end of turn, you may play one of those cards without paying its mana cost."
Inside Information80%
$2.87↑#148250.000.1 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."
Brainstealer Dragon80%
$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."
Etali, Primal Conqueror // Etali, Primal Sickness79%
$25.50↑#799↑1.65↑3.4 years↑
"When this card enters, each player exiles cards from the top of their library until they exile a nonland card. You may cast any number of spells from among the nonland cards exiled this way without paying their mana costs."
Blightwing Bandit79%
$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."
Xander's Pact79%
$0.30↓#165840.19↑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."
Mezzio Mugger78%
$0.33↑#12858↑0.074.4 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."