Damping Matrix 
Artifact
$0.72 #15507 1.25 22.9 years
Activated abilities of artifacts and creatures can't be activated unless they're mana abilities.
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Cards similar to Damping Matrix 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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"Activated abilities cost 
more to activate unless they're mana abilities."
more to activate unless they're mana abilities."