Another spell earning option.

You get a spell when you buy the circle. Beyond that, you can buy them with skill points, 1 per circle of the spell, to a max of 10. The only problem with this, is that everyone's going to immediately have 10 1st circle spells. -It might also be too expensive.

As mentioned, my other suggestion is 1 per circle when you buy the next circle. After the max circle, it costs the max to continue to do so. -I think I like this better.