Mournwhelk 

Creature — Elemental
$0.29 #24904 0.53 18.9 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 Lamprey94%
$0.11↓#17446↑0.07↓6.6 years↓
"When this Aura enters, target opponent discards two cards."
Strands of Undeath93%
$0.18↓#215980.28↓20.9 years↑
"When this Aura enters, target player discards two cards."
Ravenous Rats91%
$0.12↓#11730↑0.37↓28.2 years↑
"When this creature enters, target opponent discards a card."
Corrupt Court Official91%
$0.14↓#15922↑0.5327.3 years↑
"When this creature enters, target opponent discards a card."
Bloodhusk Ritualist91%
$0.22↓#17889↑0.33↓16.6 years↓
"When this creature enters, target opponent discards a card for each time it was kicked."
Brutal Nightstalker90%
$0.63↑#31525↓0.5328.2 years↑
"When this creature enters, you may have target opponent discard a card."
Abyssal Horror90%
$0.48↑#244600.73↑27.9 years↑
"When this creature enters, target player discards two cards."
Caligo Skin-Witch90%
$0.17↓#243680.15↓8.4 years↓
"When this creature enters, if it was kicked, each opponent discards two cards."
Shrieking Grotesque90%
$0.06↓#31227↓0.00↓20.6 years↑
"When this creature enters, if
was spent to cast it, target player discards a card."
Ebon Dragon88%
$8.13↑#278380.4729.3 years↑
"When this creature enters, you may have target opponent discard a card."
Deadeye Tormentor88%
$0.09↓#249650.00↓8.9 years↓
"When this creature enters, if you attacked this turn, target opponent discards a card."