Gonti, Canny Acquisitor 
Legendary Creature — Aetherborn Rogue
$1.56 #8302 0.56 2.5 years
Spells you cast but don't own cost 
less to cast.
less to cast.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.
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Gonti, Night Minister94%
$0.83↓#2421↑0.42↓1.7 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 Bandana90%
$1.60↑#6507↑0.20↓2.5 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."
Rev, Tithe Extractor88%
$24.64↑#2286↑0.621.9 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."
Klaw, Master of Sound88%
$0.22↓#16491↓0.25↓0.3 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."
Rogue Class84%
$1.21↓#5809↑0.07↓5.2 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."
+1 more matching line
Thief of Sanity84%
$0.38↓#3194↑0.37↓8.0 years↑
"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."
Predators' Hour84%
$0.32↓#77010.06↓4.9 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.""
Breeches, Brazen Plunderer83%
$0.18↓#4756↑0.18↓5.9 years↑
"Whenever one or more Pirates you control deal damage to your opponents, exile the top card of each of those opponents' libraries. You may play those cards this turn, and you may spend mana as though it were mana of any color to cast those spells."
Nightveil Specter82%
$0.53↓#89510.35↓13.7 years↑
"Whenever this creature deals combat damage to a player, that player exiles the top card of their library."
Curse of Hospitality81%
$0.35↓#79780.31↓4.9 years↑
"Whenever a creature deals combat damage to enchanted player, that player exiles the top card of their library. Until end of turn, that creature's controller may play that card and they may spend mana as though it were mana of any color to cast that spell."
Ramirez DePietro, Pillager81%
$0.23↓#5510↑0.00↓4.1 years↑
"Whenever one or more Pirates you control deal combat damage to a player, exile the top card of that player's library. You may cast that card for as long as it remains exiled."
Grenzo, Havoc Raiser81%
$0.32↓#1656↑0.35↓10.1 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."
Edward Kenway80%
$9.00↑#5750↑0.26↓2.3 years
"Whenever a Vehicle you control deals 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."
Fallen Shinobi78%
$5.16↑#2107↑0.537.4 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."
Brainstealer Dragon78%
$10.58↑#2254↑0.634.4 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."
Vaan, Street Thief78%
$0.35↓#71060.24↓1.4 years↓
"Whenever one or more Scouts, Pirates, and/or Rogues you control deal combat damage to a player, exile the top card of that player's library. You may cast it. If you don't, create a Treasure token."
Mindleecher78%
$0.41↓#10296↓0.24↓6.5 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."
Reno and Rude78%
$0.19↓#12762↓0.07↓1.4 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."
Blightwing Bandit77%
$4.37↑#6235↑0.553.1 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."
Black Cat, Cunning Thief77%
$0.65↓#6630↑0.531.1 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."