Hypnotic Specter 
Creature — Specter
$1.95 #8481 0.73 33.2 years
Flying
Whenever this creature deals damage to an opponent, that player discards a card at random.
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Cards similar to Hypnotic 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.
Wei Night Raiders94%
$34.89↑#25805↓0.51↓27.5 years↓
"Whenever this creature deals damage to an opponent, that player discards a card."
Abyssal Specter94%
$0.11↓#16566↓0.25↓31.4 years↓
"Whenever this creature deals damage to a player, that player discards a card."
+1 more matching line
Order of Yawgmoth94%
$0.13↓#21315↓0.29↓28.0 years↓
"Whenever this creature deals damage to a player, that player discards a card."
Zhang Liao, Hero of Hefei93%
$34.75↑#30066↓0.20↓27.5 years↓
"Whenever this card deals damage to an opponent, that opponent discards a card."
Headless Specter92%
$0.06↓#28375↓0.12↓7.4 years↓
"Whenever this creature deals combat damage to a player, if you have no cards in hand, that player discards a card at random."
Skullknocker Ogre92%
$0.13↓#29358↓0.22↓7.0 years↓
"Whenever this creature deals damage to an opponent, that player discards a card at random. If the player does, they draw a card."
Blazing Specter90%
$0.68↓#21029↓0.44↓26.0 years↓
"Whenever this creature deals combat damage to a player, that player discards a card."
Nicol Bolas90%
$1.35↓#12532↓0.60↓32.4 years
"Whenever this card deals damage to an opponent, that player discards their hand."
Urgoros, the Empty One90%
$0.21↓#19438↓0.29↓8.5 years↓
"Whenever this card deals combat damage to a player, that player discards a card at random. If the player can't, you draw a card."
Rakdos Ringleader88%
$0.13↓#26239↓0.18↓14.0 years↓
"Whenever this creature deals combat damage to a player, that player discards a card at random."
Odylic Wraith88%
$0.30↓#24145↓0.22↓29.4 years↓
"Whenever this creature deals damage to a player, that player discards a card."
Pain Magnification86%
$0.83↓#13277↓0.59↓20.5 years↓
"Whenever an opponent is dealt 3 or more damage by a single source, that player discards a card."
Larceny86%
$0.29↓#16980↓0.91↑27.0 years↓
"Whenever a creature you control deals combat damage to a player, that player discards a card."
Chilling Apparition84%
$0.31↓#26842↓0.6526.4 years↓
"Whenever this creature deals combat damage to a player, that player discards a card."
Sanity Gnawers84%
$0.23↓#28085↓0.07↓17.5 years↓
"When this creature enters, target player discards a card at random."
Silent Specter83%
$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
Liliana's Reaver83%
$0.28↓#98980.37↓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."
Headhunter82%
$0.30↓#26514↓0.28↓24.0 years↓
"Whenever this creature deals combat damage to a player, that player discards a card."
Elder Mastery82%
$0.14↓#25046↓0.39↓17.7 years↓
"Whenever enchanted creature deals damage to a player, that player discards two cards."
Entropic Specter82%
$0.46↓#26832↓0.50↓28.3 years↓
"Whenever this creature deals damage to a player, that player discards a card."