Oversoul
The Tentacled One
It seems sort of pointless to take the route your deck does though. With only eight poisonous creatures (none of which are Marsh Viper or anything), the death by poison is terribly slow, and even though you have evasion, they can just beat you down with damage long before the poison becomes lethal. You've got some removal and control elements, but so do your opponents. Or if they don't, they are probably playing a faster or entirely more potent deck than the one you listed...