Mari, the Killing Quill 
Legendary Creature — Vampire Assassin
$4.91 #2534 0.30 4.4 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 Weaver76%
$0.49↓#5765↓0.11↓3.2 years↓
"Whenever a nontoken creature an opponent controls dies, exile it."
Patron of the Vein70%
$0.31↓#3510↓0.309.0 years↑
"Whenever a creature an opponent controls dies, exile it and put a +1/+1 counter on each Vampire you control."