About the Great mage: No. That would be to much magic IMHO. As Berenthor said, the UU's and hero/king units will be tweaked to have their magic, but regularly available units shouldn't have access to it.
About the commander, I don't like to limit it to one promotion, I would prefer a couple of promotions (some might be available to Captains as well, though not all, after thinking about it having it double as captian is a bit boring). Otherwise I'd restrict him to instructor/academy
About the commander, I don't like to limit it to one promotion, I would prefer a couple of promotions (some might be available to Captains as well, though not all, after thinking about it having it double as captian is a bit boring). Otherwise I'd restrict him to instructor/academy