Extract Brain 
Sorcery
$0.28 #8657 0.29 5.2 years
Target opponent chooses X cards from their hand. Look at those cards. You may cast a spell from among them without paying its mana cost.
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Cards similar to Extract Brain 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.
Reversal of Fortune76%
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"Target opponent reveals their hand. You may copy an instant or sorcery card in it. If you do, you may cast the copy without paying its mana cost."
Mindleech Mass76%
$0.37↑#74871.00↑21.0 years↑
"Whenever this creature deals combat damage to a player, you may look at that player's hand. If you do, you may cast a spell from among those cards without paying its mana cost."
Mindclaw Shaman76%
$0.27↓#11925↓0.80↑14.3 years↑
"When this creature enters, target opponent reveals their hand. You may cast an instant or sorcery spell from among those cards without paying its mana cost."
Villainous Wealth74%
$0.27↓#2478↑0.75↑12.1 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."
Silent-Blade Oni72%
$4.46↑#2939↑0.71↑14.4 years↑
"Whenever this creature deals combat damage to a player, look at that player's hand. You may cast a spell from among those cards without paying its mana cost."
Great Intelligence's Plan70%
$0.48↑#6769↑0.65↑3.0 years↓
"Draw three cards. Then target opponent faces a villainous choice — They discard three cards, or you may cast a spell from your hand without paying its mana cost."
Omniscience70%
$5.87↑#1028↑1.60↑14.3 years↑
"You may cast spells from your hand without paying their mana costs."