Board Thread:LOC General Discussion/@comment-5920342-20130202193306/@comment-5933544-20130203011044

Also, if you want to save more PP, farm at Chapter 2-5. It has a Pwr3 common (best out of the whole chapter!). 3 Energy will get you 1 card.

1 - Farm to full card limit

2 - Evolve

3 - Farm again!

4 - Evolve again!

5 - Repeat the following until you have Full card limit - 4 or so.

6 - Enhance!!!

This is the method I used to enhance most of my cards since I couldn't spend any money on this game. You could save time by using ED and not evolving all the commons, but you might as well just buy the PM rares if you plan on spending pots anyway.