Do you really need the emerald shield? [Note: Unless you plan to use this for PvP, Arena, or FG in where you may need emerald shield, but overall, I think ice shield is much more useful)
I suggest you remove it and scrap the water pendulums completely.
Also, toadfish are good attackers, but since the main theme of this deck seems to be to pull out damage through forest spirits, and you do not possess the quanta to use the toadfishes' ability, those can be scrapped as well. I think you need to save more water quanta for the spirits..
Also, how about lightning? I don't particularly find ice bolt very useful, I don't think you'll ever have excess water quanta, and it can be better swapped for more damage. Also, add another ice shield.
Just my 2
, tweaks can probably be made to my suggestions because I haven't done any testing, thanks!
EDIT: Additionally, you won't be able to PU quinted forest spirits, and I'm pretty sure you want to grow your immortal forest spirits because they are the most steady, but that kind of ruins the strategy of PUing your strongest forest spirits for additional damage. Are the quints meant for the mind flayers?