I like to bring along a nature-3 caster with 'Relief' in the fifth slot, if it's decently feasible and the research is done already.
Early parts of scripts I not infrequently use include Summon Earth Power, Power of the Spheres (if has astral, other paths, and pearls), Quickness (for those without it natively; heh, I had a mage with +255% heroic quickness in an SP game goofing off with Black Company; usually got off four spells in the first turn...), perhaps Communion Master/Slave if I'm set up for that.
Later on, I like to have Nether Darts scripted if available, and perhaps Paralyze, Soul Slay or Petrify. Last game I was goofing off with Gifts from Heaven
... not the most precise spell, but fun.
If possible, one priest will be scripted to cast Divine Blessing, Power of the Sepulchre or similar global battle-bless spell.