Bismuth Mindrender 
Creature — Eldrazi
$0.36 #7309 0.65 2.2 years
Devoid (This card has no color.)
Menace
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.
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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.
Kotis, the Fangkeeper92%
$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."
Benthic Infiltrator87%
$0.10↓#16831↓0.24↓10.9 years↑
"Devoid"
Mist Intruder87%
$0.04↓#21025↓0.00↓10.9 years↑
"Devoid"
Culling Drone87%
$0.08↓#24050↓0.27↓10.9 years↑
"Devoid"
Dazzling Sphinx86%
$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."
Fathom Feeder86%
$0.26↓#16986↓0.12↓10.9 years↑
"Devoid"
Kheru Mind-Eater86%
$0.69↑#16840↓0.26↓9.0 years↑
"Menace"
Nashi, Moon Sage's Scion85%
$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."
Gríma, Saruman's Footman85%
$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."
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."
Stolen Goods85%
$0.25↓#9128↓0.92↑14.3 years↑
"Target opponent exiles cards from the top of their library until they exile a nonland card. Until end of turn, you may cast that card without paying its mana cost."
Ruination Guide84%
$0.13↓#20239↓0.00↓10.9 years↑
"Devoid"
Nightveil Specter84%
$0.52↑#87610.88↑13.6 years↑
"Whenever this creature deals combat damage to a player, that player exiles the top card of their library."
Sludge Crawler84%
$0.19↓#23105↓0.00↓10.9 years↑
"Devoid"
Dominator Drone84%
$0.08↓#22548↓0.22↓11.0 years↑
"Devoid"
Salvage Drone84%
$0.05↓#20737↓0.17↓10.9 years↑
"Devoid"
The Infamous Cruelclaw84%
$1.38↑#5153↑0.712.1 years
"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
Vile Aggregate83%
$0.21↓#20386↓0.00↓10.9 years↑
"Devoid"
Mind's Dilation82%
$0.40↑#2656↑0.76↑10.1 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."
Villainous Wealth81%
$0.29↓#2406↑0.6311.9 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."