Newbie question : Mage armies viable strategy?

[Meglobob]

In the Dom2demo game I am currently playing, I have found additional sites/provinces that means I can recruit at least 4 mages per turn by turn 20. At this rate would'nt I be able to have a 50+ strong mage army, protected by some gunts of course. Even if they have lvl 3 or lower in there magic paths, wouldn't they be hugely powerful?

Especially as some would be able to cast quickness which would enable them to cast 2/spells per turn.

As anyone tried this?

Would it be just possible single player or in multiplayer too?

Anyone pulled it off in MP?

Thanks in advance for yr wisdom.