I did some tinkering with a Poison deck of my own, and then remembered that you had this post here...so I guess I'll just post it here instead of making a duplicate thread.
Mark is
WATERYou'll notice that I run six Physalia in this one. I've tinkered with fewer, but I think that this kills faster. Also, the one Arsenic isn't a game winner, it's just there for early game damage and poison, and it doesn't matter if it's stolen or destroyed. I built this more for speed, so there is no defence other than Congeals (damn Otyughs...). The Flesh Recluses are there for quick damage, and they are priority targets for the AI over my tiny 2/2 Physalia.
These are a just a few games that I won. Out of about 30 games, I only lost three due to HORRIBLY bad draws (no Towers, or no Congeals).
They Firestormed me. D:
Mostly a bad draw on their end, I think o-o
I love how shields don't stop poison...lovely. ^^
Not even Eternity can stop me! *laughs evily*
You'll notice that in these screenies, I had about 15 cards left in my deck, which was an average with all the games. That means that the game was usually won in around eight turns.
Honestly, after trying out a LOT of strange and ultimately crappy ideas, I think I might settle on a deck like this. I don't have the rares to make a better deck, and I don't have the patience to farm them, so I spent a couple hours trying to come up with decks that didn't require rares that I didn't have, and that were relatively cheap, fun, and effective.