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In my opinion, nomadic ogre-birds are the way to go.
Nomads – if you have a mage, weaken the enemy hero with spells and drive them towards him – death to heroes above level 23 (lower-level ones die anyway).
Ogres – if you use the previous scheme, cast Bloodlust on the nomads, and you know the plan.
Birds – there are many of them, and they are not weak against Haven creatures.