I'm running this exact deck but replaced the chrysaora with a nightmare.
The chryaora never does much damage in my experience, since you typically kill the enemy in less than 10 turns, the poison doesn't get a chance to build up and do significant damage. You also use the forest spirits valuable water quantum and arsenic's death quantum.
Nightmare is awesome. You're not using any darkness quantum, since you're a rainbow you can clog up any none rainbow with one of your creatures and also deal an instant 2-16 damage while doing it. Even against rainbows you can use a high quantum creature such as crimson dragon to clog them up. Contrary to popular belief, this IS useful in a rush, as the average of 10 damage (Enemies typically have 3 cards in their hand, in my experience.) for 2 unused quanta AND slowing the opponent down greatly is valuable in a rush.
Any other changes you guys think would improve this deck? I'm personally using it for pvp1 and arena farming more than ai3, and it's been very successful.
(Sorry for the necro by the way, but this is still a good deck and no harm will come from discussing and improving it.)