Black Widow, Super Spy {1}{B}
Legendary Creature — Human Spy Hero
Menace
Whenever Black Widow 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 Black Widow. 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.
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Cards that do something similar expected a card that isn't here?
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Reno and Rude 80%
$0.23#12801
"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."
+1 more matching line
Nashi, Moon Sage's Scion 80%
$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."