Thief of Sanity 
Creature — Specter
$0.40 #3194 0.48 7.9 years
Flying
Whenever this creature deals combat damage to a player, look at the top three cards of that player's library, exile one of them face down, then put the rest into their graveyard. You may cast that card for as long as it remains exiled, and mana of any type can be spent to cast that spell.
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Cards similar to Thief of Sanity expected a card that isn't here?
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Klaw, Master of Sound90%
$0.27↓#17473↓0.00↓0.2 years↓
"Whenever this card deals combat damage to a player, look at the top card of that player's library, then exile it face down. You may play it for as long as it remains exiled. Mana of any type can be spent to cast a spell this way."
Gonti, Canny Acquisitor86%
$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."
Gonti, Lord of Luxury84%
$0.28↓#2046↑0.559.9 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."
Nightveil Specter83%
$0.52↑#8761↓0.88↑13.6 years↑
"Whenever this creature deals combat damage to a player, that player exiles the top card of their library."
Gonti, Night Minister82%
$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."
Dream-Thief's Bandana82%
$1.69↑#6366↓0.67↑2.4 years↓
"Whenever equipped creature deals combat damage to a player, look at the top card of their library, then exile it face down. For as long as it remains exiled, you may play it, and mana of any type can be spent to cast that spell."
Black Widow, Super Spy82%
$1.61↑#14925↓0.00↓0.2 years↓
"Whenever this card deals combat damage to a player, that player exiles cards from the top of their library until they exile a nonland card. You may put a +1/+1 counter on this card. If you don't, you may cast the exiled nonland card until end of turn and mana of any type can be spent to cast that spell."
Kotis, the Fangkeeper82%
$0.36↓#5349↓0.84↑1.4 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."
Fallen Shinobi81%
$6.62↑#2059↑0.487.2 years
"Whenever this creature deals combat damage to a player, that player exiles the top two cards of their library. Until end of turn, you may play those cards without paying their mana costs."
Black Cat, Cunning Thief80%
$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."
Rev, Tithe Extractor80%
$21.22↑#2337↑0.67↑1.8 years↓
"Whenever one or more creatures you control deal combat damage to a player, create a Treasure token, then look at the top card of that player's library and exile it face down. You may cast that card for as long as it remains exiled."
Outrageous Robbery79%
$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."
Rogue Class78%
$1.57↑#5649↓0.30↓5.1 years↓
"Whenever a creature you control deals combat damage to a player, exile the top card of that player's library face down. You may look at it for as long as it remains exiled."
Ragavan, Nimble Pilferer78%
$39.12↑#277↑1.29↑5.3 years↓
"Whenever this card deals combat damage to a player, create a Treasure token and exile the top card of that player's library. Until end of turn, you may cast that card."
Blightwing Bandit78%
$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."
Predators' Hour77%
$0.35↓#7510↓0.384.8 years↓
"Until end of turn, creatures you control gain menace and "Whenever this creature deals combat damage to a player, exile the top card of that player's library face down. You may look at and play that 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.""
Reno and Rude77%
$0.23↓#12763↓0.36↓1.2 years↓
"Whenever this card deals combat damage to a player, exile the top card of that player's library. Then you may sacrifice another creature or artifact. If you do, you may play the exiled card this turn, and mana of any type can be spent to cast it."
Mindleecher76%
$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."
Grenzo, Havoc Raiser76%
$0.28↓#1641↑0.35↓10.0 years↑
"• Exile the top card of that player's library. 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."
Bismuth Mindrender76%
$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."