Mournwhelk 

Creature — Elemental
$0.33 #25102 0.56 19.0 years
When this creature enters, target player discards two cards.
Evoke 
(You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)
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Cards similar to Mournwhelk 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.
Aspect of Lamprey92%
$0.14↓#17646↑0.41↓6.7 years↓
"When this Aura enters, target opponent discards two cards."
Strands of Undeath91%
$0.18↓#219450.12↓21.0 years↑
"When this Aura enters, target player discards two cards."
Corrupt Court Official89%
$0.13↓#15960↑0.06↓27.5 years↑
"When this creature enters, target opponent discards a card."
Ravenous Rats89%
$0.15↓#11929↑0.06↓28.3 years↑
"When this creature enters, target opponent discards a card."
Bloodhusk Ritualist89%
$0.24↓#18213↑0.85↑16.7 years↓
"When this creature enters, target opponent discards a card for each time it was kicked."
Abyssal Horror88%
$0.44↑#245720.75↑28.0 years↑
"When this creature enters, target player discards two cards."
Brutal Nightstalker88%
$0.63↑#31835↓0.16↓28.3 years↑
"When this creature enters, you may have target opponent discard a card."
Caligo Skin-Witch88%
$0.11↓#246200.658.5 years↓
"When this creature enters, if it was kicked, each opponent discards two cards."
Shrieking Grotesque88%
$0.05↓#31541↓0.17↓20.7 years↑
"When this creature enters, if
was spent to cast it, target player discards a card."
Wrench Mind88%
$0.13↓#219210.6523.0 years↑
"Target player discards two cards unless they discard an artifact card."