Neat

Mmm, nice indeed. Gets you mana you probably already have. Though phi-mana and half-mana can bypass even that restriction.

Seems like a perfectly sensible bit of space to explore. Though I'm not sure when I'd actually want to run it.

Does have the downside that it cannot do anything at all if you have, say, only one-drops from each colour in play; but that seems like a very rare occurrence.

it is cool! me like id do something like this (note im trash)

~ ETBs tapped ­: Add one mana of any color to your mana pool ­: Add two mana of any one color to your mana pool, activate this ability only if your devotion to that color is two or more