Tactics against Haven and Dungeon.

(Optimal, what does Equilibrus say about this, share it).

Equilibris says, and not only Equilibris, that the main thing is to buff the hero. Against Chaos, you need to play either for speed or for accumulating a HUGE army, so that the disintegration is noticeable like a magic arrow:D
And in general, a competitor to Chaos: Life, Barbarian.
Why Life, I already explained:)
And for the Barbarian, it's enough to level up 100% magic resistance, and that's it. He will compensate for the losses from direct damage:)