Quoting sjaminei, reply 5Using auto combat always on spellcaster mobs. Works wonders. Dark wizard? XP tome is more like it.
Then being *very careful* doing auto combat early when it looks like an easy win. Your weak champion will suddenly die to wtf damage to a lone archer.
I.E autocombat works well when it shouldn't.
autocombat versus magic strong armies is cheating in my book
I beg to differ. When you see just how *much* the AI cheats at ridicilous, you do anything to survive, so anything goes then. 
(AI does the same btw, so is it really cheating then? )