Simply put: an open map, few basic spells and nerfed siege weapons. The rest is just a brawl :)
For maximum fun play in the middle spot, as elves, against as many AI players as you can. You can make good use of your CreateAHero.
Also a 8 players free for all should be nice!
1. mid player has advantages: starting money, CP, base defence
2. spells reestrictions: you can only earn 15 spell points so use them well.
3. siege units (catapults, ents etc) take very long to build and are expensive (because i wanted to focus the battles on units and heroes).