I'm not going to credit the creation of doing this myself since I didn't do it, I've just filled in the blanks and made it more organized to view. The original creator spewed it off here and I've been using his variant a bit to get an alternate approach that I think works well. Getting further opinions would be nice, especially from outside my own group.
Ok how it works is rather than using the default two cards method in CtA, MarcinW on BGG created a system where you're using a set number of points and valuing the cards so you can get a more diverse army limited only by the cards and units you have available. The best way to get used to it is to play with 100 points and have players alternating with choosing. I've included a link to a pdf that has a chart displaying all the cards, what they do, what expansion they're from and how much MarcinW valued them at.
I have all this information in a google doc that I'd be more than willing to share with anyone that would like a more customizable copy of all the units to play with.
I look forward to comments and I think I can argue justifications for about all of the values (I'm not sure on the hundred years war stuff since I just ordered that).