Mind Sludge 
Sorcery
$0.18 #20200 1.06 24.7 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 Takenuma92%
$0.08↓#28164↓0.53↓21.4 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%
$0.17↓#224360.18↓16.7 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 Void88%
$0.10↓#30630↓0.70↓17.7 years↓
"Target player discards a card for each basic land type among lands you control."
Waking Nightmare84%
$0.07↓#25441↓0.60↓22.1 years↓
"Target player discards two cards."
Three Tragedies84%
$0.09↓#29008↓0.80↓21.7 years↓
"Target player discards three cards."
Hag Hedge-Mage82%
$0.13↓#29262↓0.17↓18.2 years↓
"When this creature enters, if you control two or more Swamps, you may have target player discard a card."
Cry of Contrition80%
$0.25↑#241250.53↓20.7 years↓
"Target player discards a card."
Unburden79%
$0.05↓#221960.18↓23.4 years↓
"Target player discards two cards."
Pain // Suffering78%
$0.13↓#27076↓0.39↓26.0 years↑
"Target player discards a card."
Mind Peel78%
$0.17↓#29387↓0.33↓28.6 years↑
"Target player discards a card."
Skull Fracture76%
$0.26↑#28834↓0.14↓25.1 years
"Target player discards a card."
No Way Out76%
$0.08↓#199150.13↓5.1 years↓
"Target opponent discards two cards. You create a 2/2 black Zombie creature token with decayed."
Deception75%
$2.66↑#29796↓0.57↓27.5 years↑
"Target opponent discards two cards."
Down // Dirty74%
$0.11↓#237710.24↓13.5 years↓
"Target player discards two cards."
Mind Ravel74%
$0.12↓#27913↓0.18↓31.4 years↑
"Target player discards a card."
Rakshasa's Secret74%
$0.03↓#25902↓0.26↓12.1 years↓
"Target opponent discards two cards. You mill two cards."
Cao Cao, Lord of Wei74%
$5.12↑#226950.39↓27.5 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."
Wrench Mind74%
$0.13↓#219210.65↓23.0 years↓
"Target player discards two cards unless they discard an artifact card."
Defile74%
$1.21↑#984↑0.25↓7.4 years↓
"Target creature gets -1/-1 until end of turn for each Swamp you control."
Gruesome Discovery74%
$0.06↓#27087↓0.57↓14.7 years↓
"Target player discards two cards."