Which spellcasting do you prefer?

[Dhavaer]

You could probably replace "per day" with "per encounter" in the class description and not unbalance them much at all, particularly when coupling Shadowcasters with Martial Adepts.

I'm not sure what to do with the out of combat mysteries, though. They might be unbalanced because they'd essentially be /at will. Maybe a recharge time, like /hour or similar.