Black Widow, Super Spy 

Legendary Creature — Human Spy Hero
$1.61 #14925 0.00 0.2 years
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 similar to Black Widow, Super Spy expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
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."
Klaw, Master of Sound82%
$0.27↓#174730.000.2 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."
Thief of Sanity82%
$0.40↓#3194↑0.48↑7.9 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."
Kotis, the Fangkeeper80%
$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."
Gonti, Canny Acquisitor78%
$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."
Bismuth Mindrender78%
$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."
+1 more matching line
Fallen Shinobi77%
$6.62↑#2059↑0.48↑7.2 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."
Gonti, Night Minister76%
$0.79↓#2503↑0.48↑1.6 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."
Ragavan, Nimble Pilferer75%
$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."
Reno and Rude74%
$0.23↓#127630.36↑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."
+1 more matching line
Dazzling Sphinx73%
$0.37↓#6415↑0.53↑5.4 years↑
"Whenever this creature deals combat damage to a player, that player exiles cards from the top of their library until they exile an instant or sorcery card. You may cast that card without paying its mana cost. Then that player puts the exiled cards that weren't cast this way on the bottom of their library in a random order."
Raven Guild Master73%
$1.05↓#21693↓0.30↑23.3 years↑
"Whenever this creature deals combat damage to a player, that player exiles the top ten cards of their library."
Daxos of Meletis73%
$0.21↓#10152↑0.13↑12.9 years↑
"Whenever Daxos deals combat damage to a player, exile the top card of that player's library. You gain life equal to that card's mana value. 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."
Dream-Thief's Bandana72%
$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."