Blue Mage could work very nicely, but with severe limits. There would be a restricted number of spells it could learn and some adversary spells cannot be learned. The Blue Mages would come up with what is essentially a BiS list of abilities for raiding. The Blue Mages would go out every patch and try to find any new spell that can be learned; so every patch the Blue Mage essentially has a new build. There could even be situational spells that Blue Mages have to go out and get for tackling certain raid bosses. SE should like this idea, it forces players to repeatedly endure content.
