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Maybe, but I had just enough money, so I gave the Sphinx 20,000 (or maybe it was a different amount, I don't remember exactly). But even with improved stats and a gathered army, I couldn't win, either on autopilot or manually. I figured it out by chance, bought the artifact, and immediately won. Moreover, I started the assault late, so a monstrous army was sitting in the castle (about 18 Titans, but I might be wrong, I'll check the save and write down the troop composition later), and when I attacked without the artifact, those bastards kept resurrecting, and resurrecting...