Scheming Fence 

Creature — Human Citizen
$0.32 #12356 0.94 4.4 years
As this creature enters, you may choose a nonland permanent.
Activated abilities of the chosen permanent can't be activated.
This creature has all activated abilities of the chosen permanent except for loyalty abilities. You may spend mana as though it were mana of any color to activate those abilities.
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Cards similar to Scheming Fence 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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"You may spend blue mana as though it were mana of any color to pay the activation costs of this creature's abilities."
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"this card has all activated abilities of creatures you control that don't have the same name as this creature."
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"Activated abilities of sources with the chosen name can't be activated unless they're mana abilities."
+1 more matching line