Klaw, Master of Sound 
Legendary Creature — Elemental Rogue Villain
$0.27 #17473 0.00 0.2 years
Deathtouch
Whenever you play a card from exile, Klaw gains indestructible until end of turn.
Whenever Klaw 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.
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Cards similar to Klaw, Master of Sound 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.
Thief of Sanity90%
$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."
Gonti, Canny Acquisitor90%
$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."
Gonti, Night Minister88%
$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."
Dream-Thief's Bandana86%
$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."
Nightveil Specter86%
$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."
Fallen Shinobi85%
$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."
Blightwing Bandit84%
$4.31↑#6132↑0.59↑3.0 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."
+1 more matching line
Gonti, Lord of Luxury84%
$0.28↑#2046↑0.55↑9.9 years↑
"When this card enters, look at the top four cards of target opponent's library, exile one of them face down, then put the rest on the bottom of that library in a random order. You may cast that card for as long as it remains exiled, and mana of any type can be spent to cast that spell."
+1 more matching line
Black Cat, Cunning Thief83%
$0.58↑#6868↑0.64↑1.0 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."
Reno and Rude83%
$0.23↓#12763↑0.36↑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."
Kotis, the Fangkeeper83%
$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."
+1 more matching line
Black Widow, Super Spy82%
$1.61↑#149250.000.2 years
"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."
Rev, Tithe Extractor82%
$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."
+1 more matching line
Outrageous Robbery82%
$0.38↑#4711↑0.40↑2.6 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."
Ragavan, Nimble Pilferer82%
$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."
Fathom Feeder82%
$0.26↓#169860.12↑10.9 years↑
"Deathtouch"
Etrata, Deadly Fugitive80%
$0.37↑#8399↑0.32↑2.6 years↑
"Deathtouch"
Rogue Class80%
$1.57↑#5649↑0.30↑5.1 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."
Mindleecher80%
$0.42↑#10096↑0.44↑6.4 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."
Grenzo, Havoc Raiser80%
$0.28↑#1641↑0.35↑10.0 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."