Wirewood Channeler 

Creature — Elf Druid
{T}: Add X mana of any one color, where X is the number of Elves on the battlefield.
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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.
Accomplished Alchemist 81%
$0.35#7296
"{T}: Add X mana of any one color, where X is the amount of life you gained this turn."
Redshift, Rocketeer Chief 81%
$0.27#9524
"{T}: Add X mana of any one color, where X is this card's power. Spend this mana only to activate abilities."
Mona Lisa, Science Geek 81%
$0.30#7161
"{T}: Add X mana of any one color, where X is this card's power."
Doc Samson, Super Psychiatrist 81%
$0.27#14867
"{T}: Add X mana of any one color, where X is this card's power."