Knowledge Pool 
Artifact
$1.08 #6759 1.14 15.6 years
Imprint — When this artifact enters, each player exiles the top three cards of their library.
Whenever a player casts a spell from their hand, that player exiles it. If the player does, they may cast a spell from among other cards exiled with this artifact without paying its mana cost.
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Cards similar to Knowledge Pool 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.
Mind's Dilation80%
$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."
Lobelia, Defender of Bag End77%
$0.28↓#72380.54↓3.2 years↓
"When this card enters, look at the top card of each opponent's library and exile those cards face down."
+1 more matching line
Jeleva, Nephalia's Scourge76%
$2.41↑#14185↓0.59↓12.8 years↓
"When this card enters, each player exiles the top X cards of their library, where X is the amount of mana spent to cast this card."
+1 more matching line
Possibility Storm76%
$1.96↑#4833↑1.42↑13.3 years↓
"Whenever a player casts a spell from their hand, that player exiles it, then exiles cards from the top of their library until they exile a card that shares a card type with it. That player may cast that card without paying its mana cost. Then they put all cards exiled with this enchantment on the bottom of their library in a random order."
Share the Spoils76%
$3.53↑#54210.48↓5.1 years↓
"When this enchantment enters and whenever an opponent loses the game, exile the top card of each player's library."
Krang & Shredder74%
$0.35↓#12913↓0.00↓0.5 years↓
"Whenever this card enter or attack, each opponent exiles cards from the top of their library until they exile a nonland card."
+1 more matching line
Korvold and the Noble Thief73%
$0.27↓#11922↓0.53↓3.0 years↓
"Exile the top three cards of target opponent's library. You may play those cards this turn."
Jester's Scepter72%
$0.39↓#25015↓0.19↓20.1 years↑
"When this artifact enters, exile the top five cards of target player's library face down. You may look at those cards for as long as they remain exiled."
Tasha's Hideous Laughter72%
$3.31↑#2933↑0.80↓5.1 years↓
"Each opponent exiles cards from the top of their library until that player has exiled cards with total mana value 20 or greater."
Valki, God of Lies // Tibalt, Cosmic Impostor72%
$3.32↑#61120.55↓5.6 years↓
"+2: Exile the top card of each player's library."
Etali, Primal Conqueror // Etali, Primal Sickness72%
$25.50↑#799↑1.65↑3.4 years↓
"When this card enters, each player exiles cards from the top of their library until they exile a nonland card. You may cast any number of spells from among the nonland cards exiled this way without paying their mana costs."
Knacksaw Clique71%
$3.35↑#17338↓0.20↓18.3 years↑
"
, 
: Target opponent exiles the top card of their library. Until end of turn, you may play that card."
, : Target opponent exiles the top card of their library. Until end of turn, you may play that card."
Mindleecher70%
$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."
Shared Fate70%
$0.53↓#15347↓0.60↓22.9 years↑
"If a player would draw a card, that player exiles the top card of one of their opponents' libraries face down instead."
+1 more matching line
Leveler70%
$3.76↑#65251.24↑22.9 years↑
"When this creature enters, exile all cards from your library."
Triple Triad70%
$0.37↓#4995↑0.50↓1.2 years↓
"At the beginning of your upkeep, each player exiles the top card of their library. Until end of turn, you may play the card you own exiled this way and each other card exiled this way with lesser mana value than it without paying their mana costs."
Etali, Primal Storm70%
$0.44↓#266↑0.85↓8.6 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."
Villainous Wealth70%
$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."
Ornate Kanzashi70%
$0.34↓#26616↓0.05↓21.6 years↑
"
, 
: Target opponent exiles the top card of their library. You may play that card this turn."
, : Target opponent exiles the top card of their library. You may play that card this turn."
Gonti, Lord of Luxury70%
$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."