Reno and Rude 

Legendary Creature — Human Assassin
Menace
Whenever Reno and Rude 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.
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Nashi, Moon Sage's Scion 97%
$3.75#1949
"Whenever this card deals combat damage to a player, exile the top card of each player's library. Until end of turn, you may play one of those cards. If you cast a spell this way, pay life equal to its mana value rather than paying its mana cost."
Lightning, Security Sergeant 93%
$0.43#10387
"Whenever this card deals combat damage to a player, exile the top card of your library. You may play that card for as long as you control this card."
+1 more matching line
Stromkirk Occultist 88%
$0.17#9669
"Whenever this creature deals combat damage to a player, exile the top card of your library. Until end of turn, you may play that card."
Grotag Night-Runner 87%
$0.12#20485
"Whenever this creature deals combat damage to a player, exile the top card of your library. You may play that card this turn."
Prophetic Flamespeaker 87%
$0.44#17038
"Whenever this creature deals combat damage to a player, exile the top card of your library. You may play it this turn."
Klaw, Master of Sound 86%
$0.30#20623
"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."
Cunning Rhetoric 85%
$4.04#2592
"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."
The Infamous Cruelclaw 82%
$1.26#4806
"Whenever this card deals combat damage to a player, exile cards from the top of your library until you exile a nonland card. You may cast that card by discarding a card rather than paying its mana cost."
+1 more matching line
Rogue Class 82%
$1.58#5453
"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."
Fishing Gear 82%
$11.65#10782
"Whenever equipped creature deals combat damage to a player, exile the top card of that player's library. If it's a permanent card, you may put it onto the battlefield under your control. If you don't, create a 1/1 blue Fish creature token."
Scarlet Witch, Chaotic Avenger 82%
$2.61#15105
"Whenever this card deals combat damage to a player, look at the top two cards of your library, then exile them face down. Then you may cast a Hero or noncreature spell from among cards exiled with this card without paying its mana cost."
Araña, Heart of the Spider 82%
$0.60#6203
"Whenever a modified creature you control deals combat damage to a player, exile the top card of your library. You may play that card this turn."
Black Widow, Super Spy 80%
$2.42#18781
"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."
+1 more matching line
Nathan Drake, Treasure Hunter 80%
$4.72#14996
"Whenever this card attacks, exile the top card of each player's library. You may cast a spell from among those cards."
Nightveil Specter 80%
$0.58#8607
"Whenever this creature deals combat damage to a player, that player exiles the top card of their library."