Slavering Nulls {1}{R}
Creature — Goblin Zombie
Whenever this creature deals combat damage to a player, if you control a Swamp, you may have that player discard a card.
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Cards that do something similar 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.
Blinding Angel 84%
$5.10#12495
"Whenever this creature deals combat damage to a player, that player skips their next combat phase."
Rakdos Ringleader 83%
$0.12#25509
"Whenever this creature deals combat damage to a player, that player discards a card at random."
Headless Specter 83%
$0.08#27598
"Whenever this creature deals combat damage to a player, if you have no cards in hand, that player discards a card at random."