As you can notice, color order is Blue, Green, Red, Yellow, Purple, Brown. It’s true for dungeons from Monday to Saturday, for colors on the filtering panel, and also for resolving mana filling of troops. But why colors go this way? Why exactly this order among 720 possible?
Sorry, cannot get the analogy. Why is it better than others?
WUBRG would suggest we use Yellow, Blue, Brown, Red, Green, Purple.
I think the answer is “this is what they decided”. Maybe one day there will be a neat story about it, but I imagine that’s just how it fell.
Just a set order they use consistently, I guess? Not sure if this carries over to the colour placement in the mana symbols, though.