Monomania 
Sorcery
$0.29 #23458 1.25 15.3 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%
$2.66↑#29796↓0.57↓27.5 years↑
"Target opponent discards two cards."
Blackmail92%
$0.51↑#198580.25↓24.0 years↑
"Target player reveals three cards from their hand and you choose one of them. That player discards that card."
Mind Rot92%
$0.04↓#12672↑0.32↓29.5 years↑
"Target player discards two cards."
Waking Nightmare89%
$0.07↓#254410.60↓22.1 years↑
"Target player discards two cards."
Three Tragedies89%
$0.09↓#29008↓0.80↓21.7 years↑
"Target player discards three cards."
Extortion88%
$0.35↑#30384↓0.22↓27.0 years↑
"Look at target player's hand and choose up to two cards from it. That player discards those cards."
Tendrils of Despair88%
$0.15↓#270510.67↓29.4 years↑
"Target opponent discards two cards."
Unhinge88%
$0.12↓#28246↓0.56↓24.7 years↑
"Target player discards a card."
Ozai's Cruelty88%
$0.19↓#13525↑0.35↓0.9 years↓
"this card deals 2 damage to target player. That player discards two cards."
Nightsnare87%
$0.05↓#273750.40↓11.3 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↑#31835↓0.16↓28.3 years↑
"When this creature enters, you may have target opponent discard a card."
Corrupt Court Official87%
$0.13↓#15960↑0.06↓27.5 years↑
"When this creature enters, target opponent discards a card."
Ravenous Rats87%
$0.15↓#11929↑0.06↓28.3 years↑
"When this creature enters, target opponent discards a card."
Dark Inquiry86%
$0.10↓#252800.69↓8.8 years↓
"Target opponent reveals their hand. You choose a nonland card from it. That player discards that card."
Pilfer86%
$0.16↓#8720↑0.65↓4.1 years↓
"Target opponent reveals their hand. You choose a nonland card from it. That player discards that card."
Abyssal Horror86%
$0.44↑#245720.75↓28.0 years↑
"When this creature enters, target player discards two cards."
Splitting Headache86%
$0.11↓#31466↓0.33↓18.5 years↑
"• Target player reveals their hand. You choose a card from it. That player discards that card."
Ostracize86%
$0.11↓#240280.42↓27.7 years↑
"Target opponent reveals their hand. You choose a creature card from it. That player discards that card."
Ebon Dragon86%
$8.17↑#28245↓0.18↓29.5 years↑
"When this creature enters, you may have target opponent discard a card."
Brainbite86%
$0.15↓#273500.06↓17.5 years↑
"Target opponent reveals their hand. You choose a card from it. That player discards that card."