Vault Plunderer 

Creature — Human Rogue
When this creature enters, target player draws a card and loses 1 life.
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Cards that do something similar 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.
Champion of Dusk 81%
$0.22#3502
"When this creature enters, you draw X cards and you lose X life, where X is the number of Vampires you control."