Needle Specter 
Creature — Specter
$1.12 #18077 0.56 18.2 years
Flying
Wither (This deals damage to creatures in the form of -1/-1 counters.)
Whenever this creature deals combat damage to a player, that player discards that many cards.
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Cards similar to Needle 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.
Silent Specter95%
$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
Headhunter94%
$0.30↓#26514↓0.28↓24.0 years↑
"Whenever this creature deals combat damage to a player, that player discards a card."
Blazing Specter94%
$0.68↓#210290.44↓26.0 years↑
"Whenever this creature deals combat damage to a player, that player discards a card."
Riptide Pilferer92%
$0.13↓#23856↓0.21↓19.7 years↑
"Whenever this creature deals combat damage to a player, that player discards a card."
Jagged Poppet92%
$0.17↓#22744↓0.38↓20.5 years↑
"Whenever this creature deals combat damage to a player, if you have no cards in hand, that player discards cards equal to the damage."
Dreamstealer90%
$0.24↓#168210.569.3 years↓
"Whenever this creature deals combat damage to a player, that player discards that many cards."
Orzhov Racketeers90%
$0.05↓#25849↓0.07↓7.7 years↓
"Whenever this creature deals combat damage to a player, that player discards a card."
Larceny90%
$0.29↓#169800.91↑27.0 years↑
"Whenever a creature you control deals combat damage to a player, that player discards a card."
Sedraxis Specter89%
$0.10↓#209760.24↓18.0 years
"Whenever this creature deals combat damage to a player, that player discards a card."
Pain Magnification88%
$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."
Okiba-Gang Shinobi88%
$1.06↓#10175↑0.5721.7 years↑
"Whenever this creature deals combat damage to a player, that player discards two cards."
Chilling Apparition88%
$0.31↓#26842↓0.6526.4 years↑
"Whenever this creature deals combat damage to a player, that player discards a card."
Wei Night Raiders88%
$34.89↑#25805↓0.5127.5 years↑
"Whenever this creature deals damage to an opponent, that player discards a card."
Fell Flagship87%
$0.36↓#12660↑0.07↓9.1 years↓
"Whenever this Vehicle deals combat damage to a player, that player discards a card."
Zhang Liao, Hero of Hefei87%
$34.75↑#30066↓0.20↓27.5 years↑
"Whenever this card deals damage to an opponent, that opponent discards a card."
Abyssal Specter87%
$0.11↓#165660.25↓31.4 years↑
"Whenever this creature deals damage to a player, that player discards a card."
+1 more matching line
Order of Yawgmoth87%
$0.13↓#213150.29↓28.0 years↑
"Whenever this creature deals damage to a player, that player discards a card."
Liliana's Reaver87%
$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."
Banshee of the Dread Choir86%
$0.87↓#12896↑0.14↓10.9 years↓
"Whenever this creature deals combat damage to a player, that player discards a card."
Whispering Specter86%
$1.96↑#11086↑0.81↑15.4 years↓
"Whenever this creature deals combat damage to a player, you may sacrifice it. If you do, that player discards a card for each poison counter they have."
+1 more matching line