The opponent dragged it out a bit, hoarding gold, from which I had just recovered the day before for a trip to the Treasury. The Treasury was decent - two Gnomes, 5 Dragons (two in the home shop), and I saw the last artifact on the map. I also bought a Necromancer's Robe and a ring with +20% spell power in the home shop. 405 mana and 37 spell power allowed me to hope for a few casts in the final battle. But the opponent surrendered.
Thanks for the game.