I was inspired by All the colours of poison (
http://elementscommunity.org/forum/index.php/topic,10495.0.html), another rainbow poison deck. I didn't like the way he build it, so I built my own version, and here it is.
Hover over cards for details, click for permalink
6qq 6qq 6u3 6u3 6u3 6u3 6u3 6u3 6u4 6ve 6ve 6ve 71a 71a 71e 71e 74a 74a 74a 7an 7ao 7ao 7gl 7gl 7gl 7gl 7jv 7qb 7qd 80b 8pk
I avoided using Puffer Fish, because it was waaay too expensive to play, but Physalia still does a great job for only 1 water. The pendulums make sure you get entropy ASAP, and it also powers the Physalia's poison. Arsenic is obviously the weapon of choice. Of course all 3 scorpions are used, unstoppable, blessing is to activate Dune and Death's ability. Mutation is there for when you have no unstoppable/blessing, so you can turn it into something more useful. Twin universe can be used on momentum deathstalker, a really powerful mutant, or your enemy's monster. Epinephrine has good synergy with scorpions as well.
It's fast and has a good win rate. I usually finish the game with 20+ poison counters. ^_^
I am gonna do statistics slowly. I did 8 battles just then, and it's 8 wins so far. One of them against Essence's dark rush in T50 (lol misclick).