OK. This is sort of OK but will encounter the following problems:
1)Drawing. Hourglasses would help
2)Randomness of mutation. The mutants aren't always going to help, so this won't be too, statistically, straight (can't think of word xP)
3)Not enough druids. If you're improving, you'll want at least 4 druids.
4)Control. I realize mutants may give you the control you need, but it's risky. I'd add at least one pulverizer.
If you can figure out how to fix those, you'll probably have an OK fg killer.