Of course nobody can't go without anti casters. Whether it would be priests, breakers, destroyers, spirit walkers, spirit breakers, dryads or faerie dragons - each of these units need to be used wisely and effectively. Even though anti-casters are important. You need to conserve their mana for battle, especially when you need to use things like Control Magic or Dispel. If you want to dispel slow and morph, let the sorceress cast a few slows or polys. Then dispel it!! You can make her waste a hell load of mana, to a point where the only thing they can do is attack or wait.