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Now, let's talk about combining things.
Chaos Army:
3 Dark Champions + 10 Hydras + 20 Goblin Knights + 20 Nightmares + all three heroes.
This gives us the following: we give the Ring of Lesser Negation to Uvod, and things will get tough for everyone. Next, both the Dark Champions (I don't think I need to explain what a Dark Champion is in terms of tactics) and the goblins will receive bonuses from the tactics, and there will be 10 Hydras in total! (instead of 6, which is quite a difference) + the troops will have fire resistance and 30% magic resistance.
I think only Life and, with a certain amount of luck, Haven could compete. Nature will be crushed without even noticing, and Death will have 8 Dark Champions, but Uvod will destroy them with 2 casts (if they have the Misfortune effect on them, it will be with 1 cast). Strength will also put up a fight, but it's unlikely to withstand the magical power of Chaos combined with tactics.
I might be wrong about something, but in my opinion, combining things is not a good idea.