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During the first and second weeks, I was on the verge of giving up several times. But on the third week, I managed to take the Castle. I couldn't find oil (I built a Grand Mage's Guild in three cities, checked all the shrines, and collected all the scrolls), and I only had 30 Grand Mages and 17 Dryads left after the Grand Offensive. The only chance I had was the Town Portal scroll, which I got from the second building in a city. The opponent didn't have control of the map. (If the Town Portal scrolls had been distributed equally, the game wouldn't have been winnable).
Thank you for the game.