Well, I see there is a template to start with but there are a couple issues

1. Elemental damage doesn’t matter
2. Great hammer seems out of place (sounds like it was chosen specifically to justify the job being different from RDM, than it actually thematically making sense on this job)
3. The only genuine distinction between your base concept and RDM is that this doesn’t cast, but it’s thematically consistent in all other areas and this further distinction might be in order
4. Why not make it scale off INT if it does magic damage?
5 what justifiable reason does it have to do magic damage?

So really, I think what players o the mystic knight are looking for are skill trees. If Fencer was a class, it’d have the ability to branch into either RDM or MYK and the overlap wouldn’t really matter. The problem is that they would still be too similar at a fundamental level like Arcanist is to SMN and SCH and I doubt players realistically want mystic knight casting anything. Personally I don’t see why that would be a bad thing especially if those cast were instant. There are benefits to having long ranged attacks on a melee dps especially since none of the other melee have a good one worth using. PLD is the only melee ranged job that can do this.

The idea of you using 6 abilities of either polar alignment is also really similar to casting the Ver spells to build mana even if the ver spells don’t require specific elemental consistency(they shouldn’t sing elements don’t matter and the same should be said here) you also phrased having 3/3 as “bringing you closer to the Red” perhaps this was a matter of phrasing but this just makes me think of RDM even more.

A lot of problems with these mystic knight post is that while they’re functionally different enough from RDM to justify it being its own job. They usually aren’t thematically and, lead me to question why we need a new melee dps to focus on 1 aspect of what the current rdm offers (being in melee range) this post also glosses over some of the more finer issues of being a melee dps. What are your positional, who’ll you have any? Why would magic require a positional when there is no skill in the game that does so. What would be the benefits of being magical melee when magic damage is underpowered in the grand scheme.

These are some things to consider. I suggest approaching his from the perspective of making mystic knight it’s own job, rather than trying to justify and design around its obvious comparisons to RDM. Consider what you want this job to do and compare it more towards the melee we currently have. Watch trends