Not a bad deck. Let's start the correction process.
Your main goal is to achieve a better deck, but retain your deck size in order not to deck out.
Remove your Druidic Staff. It's not that powerful and you won't get many Masteries with this deck regardless.
You need more drawing power. Remove both Sundials - you have plenty of shields - and replace with another Hourglass.
Remove 1 Dimensional Shield. You're a bit heavy on
quanta.
Add in 1 Quintessence. Works like a charm against creature control decks.
Add in another Rain of Fire. Very useful creature control, and you aren't using much
quanta.
Add an Ice Shield. Very useful for stopping the offensive, and you need to use more
quanta anyways.
Remove Adrenaline. You're using enough
quanta already, and it won't help you a whole lot.
Remove Chrysaora. One alone isn't going to be very good.
Add another Fallen Elf. Very useful guy.
The net change is -1 card. I would suggest adding in 3 more Shards of Gratitude and a Miracle once you win them. Replacing the Mind Flayer with an Arctic Squid wouldn't hurt, either.
Once you get that Eternity, you can slim this deck down considerably.
Hope all this helps.