Vashta Nerada 

Creature — Alien Horror
$3.24 #5353 0.40 3.0 years
Indestructible
Shadow (This creature can block or be blocked by only creatures with shadow.)
Morbid — At the beginning of each end step, if a creature died this turn, put a +1/+1 counter on this creature.
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Cards similar to Vashta Nerada 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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"This creature enters with a +1/+1 counter on it if a creature died this turn."
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"At the beginning of each end step, put a +1/+1 counter on this card for each creature put into your graveyard from the battlefield this turn."
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"At the beginning of your end step, if a creature died this turn, put a +1/+1 counter on this creature and untap it."