Пандора
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Against Nature: plague; if the druid doesn't know life magic, he's doomed after a few turns. Plus, if the necromancer knows order magic. Banish, hypnotize, sacrifice a hypnotized creature. Against Life: curses, removal of beneficial effects, death touch, wave of death, plague, and so on + raising undead.
Too many of these "ifs." I've already compared Death vs. Nature. But I used the entire spectrum of comparisons, i.e., castle, units, and magic.
And regarding Chaos vs. Order – in my opinion, this is the main intrigue of Heroes. The most interesting battles are between these factions!