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A single, Library-enhanced Tower of Magic is worth a great deal. It's practically impossible to remain without a couple of powerful spells that deprive your opponents of their... well, let's say, chances for a peaceful life and an easy victory. You'll definitely get something – either City Portal, Resurrection, Chain Lightning, or Berserk. And building the fifth level isn't so scary when you know there will be two spells there.
As for the castle itself, rather than discussing it, let's talk about the tactics: personally, I build everything necessary for the Capitol, including the Castle, during the first week; in the second week, I build ALL the dwellings, including the 7th level (the cheapness of Giants... hip-hip-hooray!), either together with Wings, which increase the growth of gargoyles, or without them – depending on whether we built a Rampart at the beginning of the game; in the third week, I focus exclusively on building the Tower of Magic, getting spells, and then I move on to upgrading units (if an excess of one resource and a shortage of another allows me to upgrade between tower levels, I upgrade gradually starting in the third week).
Well, that's it in general. :smile01: