Mages – their development.

Thank you for your answers! As a newbie, I'm also interested in learning more about duels – for example, I couldn't defeat anyone with the Dwarves. My hero, Jalib, (and others too) kept getting killed. Is it just me, or is it actually impossible? I set the Dwarf to auto-battle mode and played Jalib myself. And another question – how do I view replays?