Board Thread:LOC General Discussion/@comment-68.109.192.123-20130213215347/@comment-6238175-20130214132124

I would agree with the last poster that it's not really worth it to enhance your commons. If you can save a pp or two to buy some junk rares (you can often get most non-elite rares up to PWR 9-10 for about 1-1.5 pp each (or 2 for 3 pp )

You can take a look at the Card Power Efficiency page and sort by either ATK/Power or DEF/Power and find some cards that would be a bit cheaper. The top cards on the list when sorted won't be cheap, (unless power 5) but try something down in the middle of the list.