Slavering Nulls 
Creature — Goblin Zombie
$0.10 #28792 0.67 16.7 years
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 similar to Slavering Nulls 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.
Blazing Specter90%
$0.68↑#21029↑0.44↓26.0 years↑
"Whenever this creature deals combat damage to a player, that player discards a card."
Chilling Apparition88%
$0.31↑#268420.6526.4 years↑
"Whenever this creature deals combat damage to a player, that player discards a card."
Larceny88%
$0.29↑#16980↑0.91↑27.0 years↑
"Whenever a creature you control deals combat damage to a player, that player discards a card."
Zhang Liao, Hero of Hefei86%
$34.75↑#300660.20↓27.5 years↑
"Whenever this card deals damage to an opponent, that opponent discards a card."
Wei Night Raiders86%
$34.89↑#258050.51↓27.5 years↑
"Whenever this creature deals damage to an opponent, that player discards a card."
Abyssal Specter86%
$0.11↑#16566↑0.25↓31.4 years↑
"Whenever this creature deals damage to a player, that player discards a card."
Order of Yawgmoth86%
$0.13↑#21315↑0.29↓28.0 years↑
"Whenever this creature deals damage to a player, that player discards a card."
Liliana's Reaver86%
$0.28↑#9898↑0.37↓13.3 years↓
"Whenever this creature deals combat damage to a player, that player discards a card and you create a tapped 2/2 black Zombie creature token."
Headhunter85%
$0.30↑#265140.28↓24.0 years↑
"Whenever this creature deals combat damage to a player, that player discards a card."
Silent Specter85%
$0.51↑#234000.37↓24.1 years↑
"Whenever this creature deals combat damage to a player, that player discards two cards."
Lightning Skelemental84%
$0.36↑#10542↑0.44↓7.4 years↓
"Whenever this creature deals combat damage to a player, that player discards two cards."
Rakdos Ringleader84%
$0.13↑#262390.18↓14.0 years↓
"Whenever this creature deals combat damage to a player, that player discards a card at random."
Pain Magnification84%
$0.83↑#13277↑0.5920.5 years↑
"Whenever an opponent is dealt 3 or more damage by a single source, that player discards a card."
Specter's Shroud84%
$0.33↑#21306↑0.29↓22.7 years↑
"Whenever equipped creature deals combat damage to a player, that player discards a card."
Guul Draz Specter84%
$0.26↑#19570↑0.36↓17.0 years
"Whenever this creature deals combat damage to a player, that player discards a card."
Riptide Pilferer82%
$0.13↑#238560.21↓19.7 years↑
"Whenever this creature deals combat damage to a player, that player discards a card."
Needle Specter81%
$1.12↑#18077↑0.56↓18.2 years↑
"Whenever this creature deals combat damage to a player, that player discards that many cards."
Orzhov Racketeers80%
$0.05↓#258490.07↓7.7 years↓
"Whenever this creature deals combat damage to a player, that player discards a card."
Nicol Bolas80%
$1.35↑#12532↑0.6032.4 years↑
"Whenever this card deals damage to an opponent, that player discards their hand."
Sedraxis Specter79%
$0.10#20976↑0.24↓18.0 years↑
"Whenever this creature deals combat damage to a player, that player discards a card."