Slavering Nulls 
Creature — Goblin Zombie
$0.10 #28513 0.63 16.6 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%
$0.66↑#20741↑0.25↓25.9 years↑
"Whenever this creature deals combat damage to a player, that player discards a card."
Chilling Apparition88%
$0.30↑#265660.14↓26.3 years↑
"Whenever this creature deals combat damage to a player, that player discards a card."
Larceny88%
$0.26↑#16752↑0.99↑26.9 years↑
"Whenever a creature you control deals combat damage to a player, that player discards a card."
Headhunter86%
$0.32↑#262890.88↑23.9 years↑
"Whenever this creature deals combat damage to a player, that player discards a card."
Silent Specter86%
$0.53↑#230440.80↑23.9 years↑
"Whenever this creature deals combat damage to a player, that player discards two cards."
Zhang Liao, Hero of Hefei86%
$34.19↑#300300.50↓27.3 years↑
"Whenever this card deals damage to an opponent, that opponent discards a card."
Wei Night Raiders86%
$34.72↑#263450.89↑27.3 years↑
"Whenever this creature deals damage to an opponent, that player discards a card."
Order of Yawgmoth86%
$0.12↑#21708↑0.38↓27.9 years↑
"Whenever this creature deals damage to a player, that player discards a card."
Abyssal Specter86%
$0.11↑#16974↑0.13↓31.3 years↑
"Whenever this creature deals damage to a player, that player discards a card."
Liliana's Reaver86%
$0.42↑#10295↑0.33↓13.1 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."
Rakdos Ringleader85%
$0.13↑#259330.86↑13.9 years↓
"Whenever this creature deals combat damage to a player, that player discards a card at random."
Pain Magnification84%
$1.04↑#12930↑0.88↑20.3 years↑
"Whenever an opponent is dealt 3 or more damage by a single source, that player discards a card."
Specter's Shroud84%
$0.30↑#21053↑0.32↓22.6 years↑
"Whenever equipped creature deals combat damage to a player, that player discards a card."
Guul Draz Specter84%
$0.23↑#19223↑0.6216.9 years
"Whenever this creature deals combat damage to a player, that player discards a card."
Riptide Pilferer83%
$0.15↑#235320.33↓19.6 years↑
"Whenever this creature deals combat damage to a player, that player discards a card."
Lightning Skelemental82%
$0.32↑#10549↑0.20↓7.2 years↓
"Whenever this creature deals combat damage to a player, that player discards two cards."
Orzhov Racketeers82%
$0.04↓#255480.33↓7.6 years↓
"Whenever this creature deals combat damage to a player, that player discards a card."
Needle Specter81%
$1.11↑#17747↑0.43↓18.1 years↑
"Whenever this creature deals combat damage to a player, that player discards that many cards."
Nicol Bolas80%
$1.38↑#12349↑0.6232.3 years↑
"Whenever this card deals damage to an opponent, that player discards their hand."
Okiba-Gang Shinobi78%
$1.06↑#9913↑0.5921.6 years↑
"Whenever this creature deals combat damage to a player, that player discards two cards."