Almost a mono-water, mh?
Aren't you a bit starving on death quanta, and exceeding on Water Quanta?
And why 3 inundations? Usually 2 are well more than enough. They can't even use the Squid+Flood synergy this time.
6 purifies are also a bit too much for it. If you need that much healing, use SoG.
I like the dragons, I like less the deck size. That lonely arsenic feels a bit lost there, in 40 cards.
I assume you only have one arsenic upped, so here's the first deck.
Hover over cards for details, click for permalink
71a 7gk 7gk 7gk 7gk 7gk 7gk 7gk 7gk 7gk 7gk 7gk 7gk 7gk 7gl 7gl 7gl 7gl 7gl 7gl 7gp 7gp 7gq 7gq 7gr 7gr 7gt 7gt 7gt 7gt 7h1 7h1 7i6 7i6 7i6 7i6 7i6 8pk
This can force a lockdown, while you cut the opponent with Dragons and poisons.
I could've sure used Puffers, but they aren't probably what you're searching for, since you haven't put them first in the deck.
Hover over cards for details, click for permalink
71a 71a 71b 71b 71b 7gk 7gk 7gk 7gk 7gk 7gk 7gk 7gk 7gl 7gl 7gl 7gl 7gl 7gl 7gt 7gt 7gt 7gt 7i6 7i6 7i6 7i6 7i6 7i6 7i6 7i6 8pk
I dropped purifies and inundations here, and I added another Arsenic, and Bonewalls. This quite has some more brute power, and it's smaller.
I hope I have been giving helpful feedback.