Amko
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For Haven, I recommend Laslo and Vittorio. For the second hero, I suggest Elaine with peasants.
For Dungeon, I recommend Railag or Sinithar (at the beginning, his unit definitely destroys neutral units). And as the second hero, I take a girl with beasts (I don't remember her name).
For Inferno, I take Deleb, and I also like Agrail with the Master. His ability is devastating, and the Master is also interesting to look at.