Bone Devourer {3}{B}
Creature — Dragon
Flash
Flying
This creature enters with a number of +1/+1 counters on it equal to the number of creatures that died this turn.
When this creature dies, you draw X cards and you lose X life, where X is the number of +1/+1 counters on it.
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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.
Rhizome Lurcher 92%
$0.24#17558
"This creature enters with a number of +1/+1 counters on it equal to the number of creature cards in your graveyard."
Thought Sponge 87%
$0.31#16542
"This creature enters with a number of +1/+1 counters on it equal to the greatest number of cards an opponent has drawn this turn."
+2 more matching lines
Undergrowth Scavenger 82%
$0.21#18861
"This creature enters with a number of +1/+1 counters on it equal to the number of creature cards in all graveyards."
Centaur Vinecrasher 81%
$0.17#10983
"This creature enters with a number of +1/+1 counters on it equal to the number of land cards in all graveyards."
Boss's Chauffeur 80%
$0.30#6255
"This creature enters with a number of +1/+1 counters on it equal to one plus the number of other creatures you control."