Quicksilver Elemental 
Creature — Elemental
$20.51 #7730 0.37 23.0 years
: This creature gains all activated abilities of target creature until end of turn. (If any of the abilities use that creature's name, use this creature's name instead.)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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Cards similar to Quicksilver Elemental 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 mana as though it were mana of any color to pay the activation costs of this artifact's abilities."
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"
, 
: For one spell this turn, you may spend mana as though it were mana of any type to pay that spell's mana cost."
, : For one spell this turn, you may spend mana as though it were mana of any type to pay that spell's mana cost."
Ceta Disciple78%
$0.11↓#31312↓0.17↓25.4 years↑
"
, : Target creature gets +2/+0 until end of turn."
, : Target creature gets +2/+0 until end of turn."
Scheming Fence76%
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"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."
+1 more matching line
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"this card has all activated and triggered abilities of the last chosen card."
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"This creature has all activated abilities of all creature cards exiled with it."
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"You may spend white mana as though it were red mana."
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"This creature has all activated abilities of all creature cards exiled with it."
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"this card has all activated abilities of lands your opponents control except mana abilities."
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"This creature has all activated abilities of all cards exiled with it."
Drana and Linvala70%
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"this card has all activated abilities of all creatures your opponents control. You may spend mana as though it were mana of any color to activate those abilities."
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"This artifact has all activated abilities of the exiled card."