Well, I plan to use the information provided in the Excel spreadsheets that are Online (where, I forget). If they are not accurate, please LMK.
Regarding costs, AFAICT they are equal for all Pretenders. To increase your Dominion N times costs 7*(sigma N). That is, 7 for the first point, 14 for the second (for a total of 21), 21 for the 3rd point (for a total of 42), etc.
Magic increases work the same, except the base number is 8.
Scales and Castles are pretty much known.
This will more likely work with Access than Excel. I can run a simple query to select the parts I want (Fire 5, Earth 5, Dominion 5), and then it will tell you which Pretender gets that combination for the fewest points, and how many those are.
Right now it is supposed to be a utility to help you build a Pretender God for the right combination of things you want.
If there is anything incorrect in this post, please LMK and I'll get to work revising it.
Bayushi Tasogare