I used up all my restarts and had to play with what I had. There were too many mistakes that essentially decided the outcome. Plus, my opponent had a better setup thanks to a level 5 helmet and +12 Latverian mercenaries on respawn.
On the first turn, I lost almost my entire army of 99 pikemen because I didn't think that the hero in prison could be level 5, not 1. Then, I lost almost all my air units, which I had bought from hidden stashes, because I couldn't use Moonspell to destroy the gargoyles. In the end, I lost to Moonspell against the Guardian of Order when it hit me. I decided not to bother anymore and surrendered.

Thanks for the game!