Mari, the Killing Quill 
Legendary Creature — Vampire Assassin
$5.55 #2614 0.29 4.5 years
Whenever a creature an opponent controls dies, exile it with a hit counter on it.
Assassins, Mercenaries, and Rogues you control have deathtouch and "Whenever this creature deals combat damage to a player, you may remove a hit counter from a card that player owns in exile. If you do, draw a card and create two Treasure tokens."
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Cards similar to Mari, the Killing Quill 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.
Shelob, Dread Weaver75%
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"Whenever a nontoken creature an opponent controls dies, exile it."
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$0.39↓#5944↓0.254.4 years
"If a creature an opponent controls would die, instead exile it and put a hit counter on it."
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"Whenever a creature you control deals combat damage to a player, draw a card."