Vulturous Aven 

Creature — Bird Shaman
$0.10 #21921 0.24 11.4 years
Flying
Exploit (When this creature enters, you may sacrifice a creature.)
When this creature exploits a creature, you draw two cards and you lose 2 life.
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Cards similar to Vulturous Aven 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.
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"When this creature exploits a creature, target player draws two cards and loses 2 life."
+1 more matching line
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"When this creature enters, you may sacrifice a creature. When you do, target player draws two cards and loses 2 life."
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"When this creature enters, you draw a card and you lose 1 life."
Phyrexian Rager78%
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"When this creature enters, you draw a card and you lose 1 life."
Metalspinner's Puzzleknot78%
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"When this artifact enters, you draw a card and you lose 1 life."