I haven't tried it on heroic yet with my team, but on normal the best way for me was simply to have my group following my tank during the whole fight and just slap that prince around since he has no AOE damage why spread the toons out?

With swipe on my druid tank I also do damage on the frost tombs.... Until I got all my toons bunched up behind the tank, I was frantically running around picking up adds and trying to keep in range of the boss.