[Calahan]

As a general rule you should only ever take Magic 3, Magic 1, or Drain 2, regardless of nation (unless it's for a game with crazy settings). This is because any other choice for the Magic scale is either just an awful idea (Drain 3) or is purely wasting design points and/or research potential (Magic 0, Magic 2, Drain 1) due to the way the Magic scale settings are spaced out with regard to gaining or losing RP's.

I have not seen, or will I ever see, a good build for any nation that involves either Magic 0, Magic 2 or Drain 1 (not unless some major gameplay changes get patched/modded in). There might be a decent design involving Drain 3 for one of the nations that can ignore the RP lost with Drain, but even that is unlikely unless it's a small game, and not unless you like possibly losing sack loads of gems to the Magic Fading event (this event alone can often be enough to avoid taking Drain scales).

So while I won't comment on your build for Jomon, I will say that by taking Magic 0, you are instantly making your design a poor one, and the very first thing to do when designing a Pretender for Jomon should be to take (at least) Magic 1 and proceed from there (as is the case for 95% of nations)