[Kazilan]

Two tanks (Keldorn and Anomen) should be enough if you can alter your playstyle a little. Mazzy is incredibly deadly with a shortbow and should only tank if absolutely necessary. Your sorcerer and Jan can use summoned creatures to tank, once those spells are available. I would focus on the two tanks plus summons and watch as Mazzy kills everything at range. Valygar backstabbing is just a bonus on top of the rest, if careful. When I used him, I found that he died often because I would forget to make him retreat and hide fast enough.