Predators' Hour 
Sorcery
$0.35 #7510 0.38 4.8 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."
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Cards similar to Predators' Hour expected a card that isn't here?
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Rogue Class88%
$1.57↑#5649↑0.305.1 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."
Gonti, Canny Acquisitor87%
$1.57↑#81110.59↑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."
Dream-Thief's Bandana86%
$1.69↑#63660.67↑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."
Curse of Hospitality85%
$0.37↑#79650.49↑4.8 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."
Gonti, Night Minister84%
$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."
Outrageous Robbery82%
$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."
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."
Edward Kenway80%
$7.34↑#5573↑0.402.2 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."
Klaw, Master of Sound79%
$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."
Breeches, Brazen Plunderer79%
$0.24↓#4616↑0.23↓5.8 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."
Siphon Insight78%
$0.23↓#4324↑0.374.9 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."
Grenzo, Havoc Raiser78%
$0.28↓#1641↑0.3510.0 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."
Stolen Strategy78%
$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."
Mindleecher78%
$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."
Knacksaw Clique78%
$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."
Thief of Sanity77%
$0.40↑#3194↑0.487.9 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."
You Find Some Prisoners77%
$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."
Ixhel, Scion of Atraxa76%
$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."
Fallen Shinobi76%
$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."
Cunning Rhetoric76%
$2.19↑#2624↑0.365.4 years
"Whenever an opponent attacks you and/or one or more planeswalkers you control, exile the top card of that player's library. You may 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 it."