Needle Specter 
Creature — Specter
$1.11 #17747 0.43 18.1 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 Specter96%
$0.53↓#23044↓0.80↑23.9 years↑
"Whenever this creature deals combat damage to a player, that player discards two cards."
Headhunter95%
$0.32↓#26289↓0.88↑23.9 years↑
"Whenever this creature deals combat damage to a player, that player discards a card."
Blazing Specter94%
$0.66↓#207410.25↓25.9 years↑
"Whenever this creature deals combat damage to a player, that player discards a card."
Riptide Pilferer93%
$0.15↓#23532↓0.3319.6 years↑
"Whenever this creature deals combat damage to a player, that player discards a card."
Orzhov Racketeers92%
$0.04↓#25548↓0.337.6 years↓
"Whenever this creature deals combat damage to a player, that player discards a card."
Jagged Poppet92%
$0.17↓#22349↓0.05↓20.3 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%
$0.26↓#165040.509.1 years↓
"Whenever this creature deals combat damage to a player, that player discards that many cards."
Larceny90%
$0.26↓#167520.99↑26.9 years↑
"Whenever a creature you control deals combat damage to a player, that player discards a card."
Chilling Apparition88%
$0.30↓#26566↓0.14↓26.3 years↑
"Whenever this creature deals combat damage to a player, that player discards a card."
Pain Magnification88%
$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."
Okiba-Gang Shinobi88%
$1.06↓#9913↑0.59↑21.6 years↑
"Whenever this creature deals combat damage to a player, that player discards two cards."
Wei Night Raiders88%
$34.72↑#26345↓0.89↑27.3 years↑
"Whenever this creature deals damage to an opponent, that player discards a card."
Fell Flagship87%
$0.40↓#12331↑0.67↑8.9 years↓
"Whenever this Vehicle deals combat damage to a player, that player discards a card."
Zhang Liao, Hero of Hefei87%
$34.19↑#30030↓0.5027.3 years↑
"Whenever this card deals damage to an opponent, that opponent discards a card."
Order of Yawgmoth87%
$0.12↓#21708↓0.3827.9 years↑
"Whenever this creature deals damage to a player, that player discards a card."
Abyssal Specter87%
$0.11↓#169740.13↓31.3 years↑
"Whenever this creature deals damage to a player, that player discards a card."
Liliana's Reaver87%
$0.42↓#10295↑0.3313.1 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."
Whispering Specter87%
$1.40↑#11810↑0.14↓15.3 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."
+2 more matching lines
Banshee of the Dread Choir86%
$0.87↓#12654↑0.64↑10.8 years↓
"Whenever this creature deals combat damage to a player, that player discards a card."
Sedraxis Specter86%
$0.09↓#206580.4117.9 years
"Whenever this creature deals combat damage to a player, that player discards a card."