Monomania 
Sorcery
$0.28 #23109 1.02 15.1 years
Target player chooses a card in their hand and discards the rest.
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Cards similar to Monomania 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.
Deception93%
$2.64↑#29551↓0.15↓27.3 years↑
"Target opponent discards two cards."
Blackmail92%
$0.53↑#196750.32↓23.9 years↑
"Target player reveals three cards from their hand and you choose one of them. That player discards that card."
Mind Rot92%
$0.03↓#12522↑0.41↓29.3 years↑
"Target player discards two cards."
Tendrils of Despair90%
$0.16↓#268170.60↓29.2 years↑
"Target opponent discards two cards."
Waking Nightmare89%
$0.04↓#250640.46↓21.9 years↑
"Target player discards two cards."
Three Tragedies89%
$0.11↓#28612↓0.52↓21.6 years↑
"Target player discards three cards."
Extortion88%
$0.35↑#30086↓0.43↓26.9 years↑
"Look at target player's hand and choose up to two cards from it. That player discards those cards."
Unhinge88%
$0.10↓#27991↓0.12↓24.6 years↑
"Target player discards a card."
Ozai's Cruelty88%
$0.22↓#13687↑0.00↓0.8 years↓
"this card deals 2 damage to target player. That player discards two cards."
Nightsnare87%
$0.08↓#269470.31↓11.1 years↓
"Target opponent reveals their hand. You may choose a nonland card from it. If you do, that player discards that card. If you don't, that player discards two cards."
Brutal Nightstalker87%
$0.63↑#31525↓0.53↓28.2 years↑
"When this creature enters, you may have target opponent discard a card."
Ravenous Rats87%
$0.12↓#11730↑0.37↓28.2 years↑
"When this creature enters, target opponent discards a card."
Corrupt Court Official87%
$0.14↓#15922↑0.53↓27.3 years↑
"When this creature enters, target opponent discards a card."
Dark Inquiry86%
$0.12↓#250430.79↓8.6 years↓
"Target opponent reveals their hand. You choose a nonland card from it. That player discards that card."
Pilfer86%
$0.16↓#8774↑0.11↓4.0 years↓
"Target opponent reveals their hand. You choose a nonland card from it. That player discards that card."
Abyssal Horror86%
$0.48↑#244600.73↓27.9 years↑
"When this creature enters, target player discards two cards."
Splitting Headache86%
$0.11↓#31132↓0.29↓18.3 years↑
"• Target player reveals their hand. You choose a card from it. That player discards that card."
Ostracize86%
$0.14↓#237610.50↓27.6 years↑
"Target opponent reveals their hand. You choose a creature card from it. That player discards that card."
Ebon Dragon86%
$8.13↑#27838↓0.47↓29.3 years↑
"When this creature enters, you may have target opponent discard a card."
Brainbite86%
$0.15↓#269680.24↓17.3 years↑
"Target opponent reveals their hand. You choose a card from it. That player discards that card."