I think Green Sun Zenith is strictly better the genesis wave personally - you know exactly what you're paying mana for rather then letting chance decide. My suggestion is to throw in a birthing pod or two so you can pop your Putrefax's that are about to hit the graveyard into Swarmlords. This deck still looks like it rapes face though.
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I'm worried about Spine of Ish Sah's insane cost and whether it'll ever actually hit the board.
Also, Skithiryx is a great way to surprise someone with 4 poison counters.
This is going to be tough against another infect deck - you should have in your sideboard another win-condition to trade Vatmother with (incase of tumble magnet debachery). Bone hoard seems out of place and inkmoth nexus is a must. Otherwise this seems like a fun deck. Corrupted Conscience is hilarious ;)
Thanks for the advice - I had consuming vaoprs in because the metagame I'm facing is a lot of white weenie pro black/green decks. I think you're definitely right about the contagion clasps - I'll try taking it out for more spell removal.
I've played against this deck many times to know its a pain in the ass ;)
I was thinking of 2-3 Skinrenders for more removal. 3 -1/-1 counters a turn ain't too shabby with Skinrender & Vensor.
Go For the Throat and Mana Leak are on my list of singles to buy - I currently have none at all. Good suggestion on the Mirrorworks though... That'd be ridiculous good thrown in there.