Tactics for playing as the Sylvan faction.

Ment, my friend, are you planning to attack an army of mages with just unicorns? Powerful archers, for example, don't have that magical protection. And an experienced mage should have the Staff of Sar-Iss, as Lord de Sat rightly pointed out. Attacking with Chaos creatures against a mage isn't entirely pointless. Taking Exhaustion and then stopping there – yes, that's possible. You could also take a enchanted ballista through Chaos... it would deal a lot of damage... but against whom? Hmm... a dead end... =)
What does it mean, there are artifacts? You can find all sorts of different artifacts, like the Cloak of Silanna and magical boots, but the problem is that the mage WILL still cast spells because he has a lot of magic :P