[Bullock]

Wow i'm surprised by your answer Gandalf.
I think it's totally untrue to say that it's always the same dom & spells used.
Concerning the dom there is some popular pick (for instance +1 magic scale) but dom settings are usually set to fit the nation choice but also the strategy you are planning.

Now concerning spells there are the popular ones (such as fog warrior mentioned earlier) but finally i think 90% of the spells are usable, some ofc only in niche use.

However i haven't the experience of many ppl here, but dom3 sounds to me complex enough in MP so you can't win by just applying a common guide (such as Baalz's) despite his high quality.