Do you have a game store anywhere near your home - or the option to download a .pdf file for a minimal outlay of cash?
A power pretty much identical to this appears in the excellent
The Mutant Experience published at the beginning of this year. A full 128-pages of new mutations and new ways to use old mutations, along with variants, overkills and the bad things that can sometimes happen.
As well as having the option to get a copy from Mongoose or your local game store, you can also get a .pdf copy from
DriveThruRPG.com at a slightly discounted price (almost 25% off).
Well worth the read. Save your pocket money/spare change/a little of your wages/annual interest on that savings account you've forgotten about/other (delete as applicable) and get yourself a copy. You won't regret it.