The deck looks quite decent, I would recommend:
- upgrade the Fallen Elf as soon as possible since mutants are your source of damage.
- Maybe replace the Fog Shield, I'm not a huge fan of it in this particular type of deck, I personally have a second Bone Wall in my FG Rainbow, you should try with it: especially with 2 Rain of Fire in your deck. If your idea was to use the Air quantum then an Air Nymph can be very nice against some gods if you have it, if not a Firefly Queen can be very nice to do damages/create mutant material.
- You have quite many cards, I would also recommend to try getting some of the less important out to maximize your chances of getting what you really need fast. The cards I would recommend to take out: maybe a sundial or two, one hourglass as 4 seems way enough to me, Flying Weapon...
good luck