I hadn't noticed the combo before, but it is limited to Fire spells only, which really hinders its power. That, and I have a tendency to make Novas cry when they hit the 3rd encounter for the day. If you can only use it a total of 6/encounter, and only 13/14 uses a day, then it really isn't much of a problem for me to deal with. Playing a Red Moon Magus like that will be a bad decision on the player's part though.
Eratta'ing it would be worth my time though, as I am transferring the class here anyway. And most of my other players have opinions about the Blue and Green Magus options being considerable more useful at the lower levels. You can't get that trick to work before 20th, as you need Recumen's Eye just to pull it off.
And you will be using up spell slots like crazy if the enemies are Fire immune/resistant. Its more of a death-sentence to try a nova in one of my games, as I have established with a number of my RL players (namely my little brother).
Speaking of Agita, I am interested too. Thinking of statting out Vita from Magical Girl Lyrical Nanoha and playing her in Ixa'taka or so, with a few fluff changes of course.
Welcome to the team.
Ixa'taka crew, sheet links on the SoA thread, please (not here, the Reference Thread).