Kotis, the Fangkeeper 
Legendary Creature — Zombie Warrior
$0.36 #5349 0.84 1.4 years
Indestructible
Whenever Kotis 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.
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Cards similar to Kotis, the Fangkeeper 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.
Bismuth Mindrender92%
$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."
Fallen Shinobi90%
$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."
Nightveil Specter88%
$0.52↑#8761↓0.8813.6 years↑
"Whenever this creature deals combat damage to a player, that player exiles the top card of their library."
Villainous Wealth86%
$0.29↓#2406↑0.63↓11.9 years↑
"Target opponent exiles the top X cards of their library. You may cast any number of spells with mana value X or less from among them without paying their mana costs."
Daxos of Meletis85%
$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."
Dazzling Sphinx84%
$0.37↑#64150.53↓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."
Etali, Primal Storm83%
$0.44↑#266↑0.858.6 years↑
"Whenever this card attacks, exile the top card of each player's library, then you may cast any number of spells from among those cards without paying their mana costs."
Mind's Dilation83%
$0.40↑#2656↑0.7610.1 years↑
"Whenever an opponent casts their first spell each turn, that player exiles the top card of their library. If it's a nonland card, you may cast it without paying its mana cost."
Klaw, Master of Sound83%
$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."
+1 more matching line
Gríma, Saruman's Footman82%
$1.60↑#3164↑0.36↓3.2 years↑
"Whenever this card 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."
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."
Nashi, Moon Sage's Scion82%
$3.16↑#2033↑0.35↓4.5 years↑
"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."
Dream Harvest82%
$0.38↑#6462↓0.00↓0.6 years
"Each opponent exiles cards from the top of their library until they have exiled cards with total mana value 5 or greater this way. Until end of turn, you may cast cards exiled this way without paying their mana costs."
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."
Black Widow, Super Spy80%
$1.61↑#14925↓0.00↓0.2 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."
Raven Guild Master79%
$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."
Grenzo, Havoc Raiser79%
$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."
The Key to the Vault78%
$0.37↑#2165↑0.23↓2.4 years
"Whenever equipped creature deals combat damage to a player, look at that many cards from the top of your library. You may exile a nonland card from among them. Put the rest on the bottom of your library in a random order. You may cast the exiled card without paying its mana cost."
Rev, Tithe Extractor78%
$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."
Stolen Strategy78%
$0.34↓#45630.65↓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."