Cordial Vampire {B}{B}
Creature — Vampire
Whenever this creature or another creature dies, put a +1/+1 counter on each Vampire you control.
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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.
Hooded Hydra 81%
$1.43#3258
"When this creature dies, create a 1/1 green Snake creature token for each +1/+1 counter on it."
Boss's Chauffeur 81%
$0.30#6255
"When this creature dies, create a 1/1 green and white Citizen creature token for each +1/+1 counter on it."