I realised the other day that Shamans are underestimated. They're not good attackers, and all people do with them is heal and revive, but people tend to overlook the Shaman Shield or whatever it is called. Basically, its that little wooden thing in a shamans inventory, and it fires a continuous stream which uses very little mana, and takes a long time to deplete. It acts a lot like a shield tower (and reduces building damage by 60%), but only on one building. You target the building and continuously shoot it. When paired up with a healing spire or 2, it is quite effective against a balli, because the balli is rendered ineffective while some1 else can go pwnz0r it. Now, if you were to combine a couple of shamans, a couple of healing spires and a couple guys with blaze, you would have a pretty darn good defence IMO.