Board Thread:Game Discussion/@comment-50.161.62.199-20130801090624/@comment-13295069-20130802001409

Save your two "chains" for the highest level Soundwave (hard) boss you can take down. You will get a 2 evo SW, plus much more event points.

Then just farm the SW level that is most efficient for you in terms of cubes spent per points gained, and use energon nets to try for SW. For me it was SW 7, but I need to recheck after the update. I've gotten 2 SW evo cards via nets. With my 2 chains I now have a MEM SW and he's nice.