Black Salvo should be maxed out at 3. You can return a used Salvo to hand with it. I'm not sure exactly why you chose to go with the attribute manipulation road with this deck since Genex are better at abusing their inherent DARK attribute with cards like DAD, Dark Creator, Duradark, etc. In any case, I think Volcannon along with Chemistrer is unnecessary and too slow. I don't really see the point of Ultimate Offering all that much unless you're trying to go for Crusher abuse, but I think it's better if you try to make the DARK abuse more consistent.
- 2 Genex Ally Changer
- 2 Genex Ally Volcannon
- 2 Genex Ally Chemistrer
+ 2 Black Salvo
+ 2 Genex Ally Duradark
+ 1 Dark Armed Dragon
+ 1 DNA Transplant