Abyssal Specter 
Creature — Specter
$0.11 #16566 0.25 31.4 years
Flying
Whenever this creature deals damage to a player, that player discards a card.
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Cards similar to Abyssal Specter 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.
Order of Yawgmoth100%
$0.13↑#21315↓0.2928.0 years↓
"Whenever this creature deals damage to a player, that player discards a card."
Wei Night Raiders100%
$34.89↑#25805↓0.51↑27.5 years↓
"Whenever this creature deals damage to an opponent, that player discards a card."
Zhang Liao, Hero of Hefei99%
$34.75↑#30066↓0.2027.5 years↓
"Whenever this card deals damage to an opponent, that opponent discards a card."
Odylic Wraith96%
$0.30↑#24145↓0.2229.4 years↓
"Whenever this creature deals damage to a player, that player discards a card."
Blazing Specter96%
$0.68↑#21029↓0.44↑26.0 years↓
"Whenever this creature deals combat damage to a player, that player discards a card."
Nicol Bolas96%
$1.35↑#12532↑0.60↑32.4 years↑
"Whenever this card deals damage to an opponent, that player discards their hand."
Hypnotic Specter94%
$1.95↑#8481↑0.73↑33.2 years↑
"Whenever this creature deals damage to an opponent, that player discards a card at random."
Chilling Apparition93%
$0.31↑#26842↓0.65↑26.4 years↓
"Whenever this creature deals combat damage to a player, that player discards a card."
Larceny92%
$0.29↑#169800.91↑27.0 years↓
"Whenever a creature you control deals combat damage to a player, that player discards a card."
Pain Magnification92%
$0.83↑#132770.59↑20.5 years↓
"Whenever an opponent is dealt 3 or more damage by a single source, that player discards a card."
Silent Specter92%
$0.51↑#23400↓0.37↑24.1 years↓
"Whenever this creature deals combat damage to a player, that player discards two cards."
+1 more matching line
Headhunter90%
$0.30↑#26514↓0.2824.0 years↓
"Whenever this creature deals combat damage to a player, that player discards a card."
Liliana's Reaver90%
$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."
Entropic Specter90%
$0.46↑#26832↓0.50↑28.3 years↓
"Whenever this creature deals damage to a player, that player discards a card."
Guul Draz Specter90%
$0.26↑#195700.36↑17.0 years↓
"Whenever this creature deals combat damage to a player, that player discards a card."
Lightning Skelemental90%
$0.36↑#10542↑0.44↑7.4 years↓
"Whenever this creature deals combat damage to a player, that player discards two cards."
Rakdos Ringleader89%
$0.13↑#26239↓0.1814.0 years↓
"Whenever this creature deals combat damage to a player, that player discards a card at random."
Fungal Shambler89%
$0.27↑#30344↓0.3325.4 years↓
"Whenever this creature deals damage to an opponent, you draw a card and that opponent discards a card."
Elder Mastery89%
$0.14↑#25046↓0.39↑17.7 years↓
"Whenever enchanted creature deals damage to a player, that player discards two cards."
Specter's Shroud88%
$0.33↑#21306↓0.2922.7 years↓
"Whenever equipped creature deals combat damage to a player, that player discards a card."