Fire Dragon {6}{R}{R}{R}
Creature — Dragon
Flying
When this creature enters, it deals damage to target creature equal to the number of Mountains 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.