I would love for each troop type to have a troop the requires each individual color in some form.
For example, there is no Construct yet that requires Green mana for it’s ability.
I mean I feel like they will get there eventually, but I would just love to not be limited to certain color types when it comes to running tribal decks.
But it fits the profile. Green gems represent nature, a complete opposite of constructs and machines.
I don’t think we will see a green construct. As well as we won’t see a troop linked with burning using blue (water) etc.
“I’m back baby!”
I agree with @DonBoba, and I would add that I specifically don’t want “one of each color” to enter the game at all. The different colors are interesting only insofar as they differ from one another. (Same goes for types, kingdoms, and rarities, though to a lesser degree.)
Well, I wouldn’t expect a dragon to be a water type unless it’s some frozen dragon, nor would I expect a dragon to be earth type since a dragon is supposed to be a winged beast.
And then we have Celestasia / Venbarak while none of them seems to be breathing ice
And we have 4 earth dragon. Bone Dragon, who is arguably not even a dragon anymore, Emperina, the only dragon that I know of that leaves under a mountain of her own free will ! Sheggra, who doesn’t even look like a Dragon, and Wyvern, who doesn’t actually seem to have a good reason to be an earth related dragon.
Bottom line is that I understand OP’s point : it would only be fair toward each type to have the same kind of diversity, especially when we consider that their type bonuses are designed to be balanced.
I mean, if at least we had better bonus for playing dwarves, that are very scarce in the game and don’t cover all mana colors than when playing Dragons, that are almost all legendaries, covering all mana colors and very powerful, it would bring more diversity in the decks we build.
In norse and japanese mythology, a sea serpent is also called a sea dragon. Leviathan comes to mind.
Hmmmm, Celestasia might have some attributes that can be compared to Leviathan I guess…
But Serpent used to be that water themed dragon and they moved him to the Beast troop type.
Besides, my point still holds regardless 
Your point definitely stands.
For the shared colors, many of the troops (though by no means all) have aspects of the shared-color traitstone instead of the solid colors themselves. So in Bone Dragon’s case, the Brown/Purple combination represents skulls (Arcane Skull Traitstone) which is a good fit.
Wyvern takes Arcane Forest Traitstones, which I suppose you could make an argument supporting a forest as their native habitat. Maybe? [shrug]
Celestasia heals.
Healing in gaming has a history of being related to Water.
Exactly correct about celestasia and water/healing.
And bone dragon? Bones come from earth.
Shegra? She is tied to lava montain in broken spire, and there for her origin is tied to earth and fire. Brown/red.
Plus she breathes, y’know…fire.
Why are you all arguing on my example instead of my point? x)
But it will take more than that to take my example down : Emperina also heals, but she is a fire dragon
Cauterizing!
Also to be quite honest, dragons are a bad example of color specialization, since in many fantasy worlds they span the gamut of colors and magic types. Goblins and elves being green, dwarves being brown – those sorts of color specs are more easily defensible.
There are 12 Bl/R Troops in the game thus far, and they cover the board in types, and turns out one is a construct.
There are only 9 G/Br Troops in the game, and Archon Statue is Divine…even though it’s a stone carving…constructed by man.
Just make a card that’s a robot made with wood and BAM! G/Br Construct, at your service. Eazy, peezy, Covergirl. 
I also understand that most Troop Types tend to stick to a main color (Fey/Elf/Wildfolk stick with G/Y, Undead usually have P, Giants and Constructs usually having Br), but the also do some left-field stuff occasionally, and there’s no harm in having a couple Troops of a certain type break the mold (like Borer: it’s R/Bl, and Bl seems a bit odd for a Construct, right? But it happened).
So if you have, say, only one G/Br Construct ever made…that would be perfect. Make it unique and not have a very ‘construct-like ability’ and then people will build what they choose with it.
Wich is why I picked them !
Although they aren’t bound by color specialisation constraints, they get an equivalent bonus to those of every other types
Also, since this seems to have gone into a Troop Theme vs Actual Troop Mana colors, let’s break it all down now with the Troop Types that have bridged the color gap and accepted diversity:
Humans (because humans can be or accomplish anything, know for feats, blah blah blah I feel like whenever Human is a type in a game and this excuse is given it seems so arrogant and meta, but eh whatevs.)
Beasts (because nature’s fauna comes in all sorts of shapes and sizes)
Daemons (because torment and suffering ALSO comes in all shapes and sizes)
Divine (because blessing and deliverance…you get the idea)
Dragons (because this game is about magic, magics has different forms, and dragons are natural magic beings. Plus, there have been different colored dragons with different skills and magic for ages)
Elementals (Same as dragons, just with less scales, teeth and treasure)
Giants (because Giants are similar to humans…you know, except for the whole size thing)
Knights (because not every Knight follows the code [or is still among the living])
Marauders (because the limits of what they wish to pillage knows no bounds)
Monsters (like beasts, but usually worse)
Wildfolk (because FURRIES ARE EVERYWHERE)
That leaves only five troops that have yet to bridge the diversity gap, and most of them are only by ONE color: Construct, Dwarf, Elf (being the special case, as it’s missing both Br and Bl), Fey, and Undead.
I don’t see why they can’t make one or two to bridge that gap, then go back and stick with the main thing.
Fey is only missing Brown but Treant boosts off of Brown, making a Fey team able to utilize all colours.
When analyzing Troop types and colour usage, are you people factoring in things like Spells boosting off of colours?
I was not originally, but that’s a valid point: if a troop boosts off a color that’s not part of it’s mana color, that’s very close to being of that mana cost. This might also count in regards to those who change mana into another color, but that’s a different story altogether.
Treant allows the Fey to have someone who works off of Brown so long as his ability is up, technically giving Fey access to all colors.
Elves still have nothing for Yellow or Blue, Dwarves for Green, Constructs for Green, and Undead for Green.
Wow, lots of Troops not eating their greens…come on men, get it together! 