I would let the saurolich cast mind duel assuming i fight in own dominion
.
If you have no items and add contestant 4 , the vq , she almost surely wins 90% of the battles because she has most built in goodies .
If you would be more specific would be good because body etheral e.g. is good against common troops but canceled by astral weapon or magic weapons .
Finally i wonder why you left out so important buffs as soul vortex , phönix pyre etc.
I personally would probably cast the following buffs : Quickness , invulnerability , phönix pyre , fire shield and soul vortex .