Mind Sludge 
Sorcery
$0.17 #19986 0.90 24.6 years
Target player discards a card for each Swamp you control.
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Cards similar to Mind Sludge 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.
Sink into Takenuma93%
$0.10↓#27880↓0.71↓21.3 years↓
"Return any number of Swamps you control to their owner's hand. Target player discards a card for each Swamp returned this way."
Mire's Toll90%
$0.15↓#221500.12↓16.6 years↓
"Target player reveals a number of cards from their hand equal to the number of Swamps you control. You choose one of them. That player discards that card."
Voices from the Void89%
$0.08↓#30339↓0.50↓17.6 years↓
"Target player discards a card for each basic land type among lands you control."
Waking Nightmare85%
$0.04↓#25064↓0.46↓21.9 years↓
"Target player discards two cards."
Three Tragedies84%
$0.11↓#28612↓0.52↓21.6 years↓
"Target player discards three cards."
Hag Hedge-Mage84%
$0.13↓#28775↓0.38↓18.1 years↓
"When this creature enters, if you control two or more Swamps, you may have target player discard a card."
Cry of Contrition82%
$0.20↑#239320.36↓20.6 years↓
"Target player discards a card."
Mind Peel80%
$0.16↓#29088↓0.76↓28.5 years↑
"Target player discards a card."
Unburden80%
$0.05↓#219160.37↓23.3 years↓
"Target player discards two cards."
Pain // Suffering78%
$0.13↓#26792↓0.77↓25.9 years↑
"Target player discards a card."
Skull Fracture78%
$0.23↑#28582↓0.56↓24.9 years
"Target player discards a card."
Deception76%
$2.64↑#29551↓0.15↓27.3 years↑
"Target opponent discards two cards."
Rakshasa's Secret76%
$0.04↓#25586↓0.42↓11.9 years↓
"Target opponent discards two cards. You mill two cards."
Cao Cao, Lord of Wei76%
$5.21↑#224080.71↓27.3 years↑
"
: Target opponent discards two cards. Activate only during your turn, before attackers are declared."
: Target opponent discards two cards. Activate only during your turn, before attackers are declared."
No Way Out76%
$0.08↓#196200.19↓4.9 years↓
"Target opponent discards two cards. You create a 2/2 black Zombie creature token with decayed."
Down // Dirty76%
$0.08↓#234790.21↓13.3 years↓
"Target player discards two cards."
Mind Ravel76%
$0.12↓#27628↓0.17↓31.3 years↑
"Target player discards a card."
Mournwhelk76%
$0.29↑#24904↓0.53↓18.9 years↓
"When this creature enters, target player discards two cards."
Raven's Crime75%
$0.17#15724↑0.47↓18.1 years↓
"Target player discards a card."
Wrench Mind75%
$0.13↓#216090.48↓22.9 years↓
"Target player discards two cards unless they discard an artifact card."