Spirit Mascot 

Creature — Spirit Ox
Whenever one or more cards leave your graveyard, put a +1/+1 counter on this creature.
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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.
Willow Geist 100%
$0.29#10368
"Whenever one or more cards leave your graveyard, put a +1/+1 counter on this creature."
Attuned Hunter 86%
$0.15#20012
"Whenever one or more cards leave your graveyard during your turn, put a +1/+1 counter on this creature."
Spirit of Resilience 86%
$0.20#13622
"Whenever one or more cards leave your graveyard, put a +1/+1 counter on this creature, then you may have this creature become a copy of an artifact or creature card from among those cards until end of turn."
Stonebinder's Familiar 83%
$0.25#20013
"Whenever one or more cards are put into exile during your turn, put a +1/+1 counter on this creature. This ability triggers only once each turn."
Cyan, Vengeful Samurai 82%
$0.21#10607
"Whenever one or more creature cards leave your graveyard, put a +1/+1 counter on this card."
Voracious Brood 81%
$0.73#29259
"Whenever one or more creature cards are put into your graveyard from anywhere, put that many +1/+1 counters on this creature."
Dutiful Knowledge Seeker 81%
$0.18#18587
"Whenever one or more cards are put into a library from anywhere, put a +1/+1 counter on this creature."