Shadow Stinger 
Creature — Vampire Rogue
$0.16 #23513 0.10 6.1 years
Tap another untapped Rogue you control: This creature gains deathtouch until end of turn.
Whenever this creature deals combat damage to a player, that player mills three cards. (They put the top three cards of their library into their graveyard.)
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Cards similar to Shadow Stinger 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.
Shriekgeist89%
$0.10↓#239230.00↓14.7 years↑
"Whenever this creature deals combat damage to a player, that player mills two cards."
Crosstown Courier83%
$0.04↓#251830.43↑14.0 years↑
"Whenever this creature deals combat damage to a player, that player mills that many cards."
Reef Pirates82%
$0.18↑#278570.0731.1 years↑
"Whenever this creature deals damage to an opponent, that player mills a card."
Merfolk Windrobber81%
$0.17↑#9407↑0.21↑6.1 years
"Whenever this creature deals combat damage to a player, that player mills a card."
Necromaster Dragon81%
$0.29↑#193900.24↑11.6 years↑
"Whenever this creature deals combat damage to a player, you may pay . If you do, create a 2/2 black Zombie creature token and each opponent mills two cards."
. If you do, create a 2/2 black Zombie creature token and each opponent mills two cards."
Expedition Skulker80%
$0.07↓#228640.056.1 years
"This creature has deathtouch as long as you control another Rogue."
Mindscour Dragon78%
$0.16#233790.29↑11.7 years↑
"Whenever this creature deals combat damage to an opponent, target player mills four cards."
Balshan Beguiler78%
$0.15↓#30600↓0.28↑25.1 years↑
"Whenever this creature deals combat damage to a player, that player reveals the top two cards of their library. You choose one of those cards and put it into their graveyard."
Sure-Footed Infiltrator78%
$0.16#17492↑0.28↑6.1 years
"Whenever this creature deals combat damage to a player, draw a card."
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Eye Collector76%
$0.16#10456↑0.167.0 years
"Whenever this creature deals combat damage to a player, each player mills a card."
Screeching Silcaw76%
$0.12↓#29197↓0.1216.1 years↑
"Whenever this creature deals combat damage to a player, if you control three or more artifacts, that player mills four cards."
Festerleech74%
$0.17↑#203780.072.7 years↓
"Whenever this creature deals combat damage to a player, you mill two cards."
Nimana Skydancer74%
$0.08↓#232510.056.1 years
"When this creature enters, target opponent mills two cards."
Sphinx Mindbreaker72%
$3.42↑#15193↑0.31↑6.7 years
"When this creature enters, each opponent mills ten cards."
Anowon, the Ruin Thief71%
$0.48↑#9774↑0.44↑6.1 years
"Whenever one or more Rogues you control deal combat damage to a player, that player mills a card for each 1 damage dealt to them. If the player mills at least one creature card this way, you draw a card."