Myr Moonvessel {1}
Artifact Creature — Myr
When this creature dies, add {C}.
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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.
Su-Chi Cave Guard 87%
$0.15#9398
"When this creature dies, add eight {C}. Until end of turn, you don't lose this mana as steps and phases end."