nm, these only allow you to fetch the Godsire if you haven't drawn it yet. i like your current build more than with either of these additions. summoning trap though? i know this doesn't fit well here either, but Omnath could be sick coupled with Genesis Wave.
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or even Altar of Bone... but that's only if you find either addition more valuable than what you have in there.
Fauna Shaman is the most recent thing i can think about
sterling grove and enlightened tutor are nasty fetchers for your win conditions too.
this is a disgusting casual deck. i'm jealous i didn't think of this.
i like the changes you've made, it seems much more feasible. check out Nature's Claim over Naturalize for SB since your opponents health count is usually of little consequence.
updated Nov 3rd
i'm only half sold with the Harrow bit. since speed is important i'd recommend Harrow as mid-early game if you feel stuck rather than standard Green ramp that seems to play it asap. again, it could be a distraction from the purpose at hand - but coming from a U/B infect background, i'd kill for some mana accel.
Harrow or some other mana accel instead of Bellow? since you can play 90% of your deck for 3 mana or less, Harrow could get you pumping out creatures and your Instants even quicker if you get stuck without a land draw. i like the Vines, Groundswell, Giant Growth thing. i dig the Pinions for evasion and first strike. FS with infect creatures is pretty enjoyable since you get to sap the killing power of any blocker... still feels a little heavy on equipment.
stick with Cystbearer. it fits your mana curve well and as a 2/3 can stick around for a couple turns or at least eat a lightning bolt. i run U/B infect and i'd kill for a black version of Cystbearer (Contagious Nim at 2/2 is close but not quite sexy enough to make the cut over Ichor Rats).
insta-metal craft with precursor golem... for Stoic rebuttal? ahh and the distortion strike copy, amiright? attacking for 9 unblockable isn't bad with a protective emerge unscathed. rebound for both too. i like. and that's only 1/5 of the deck. i'm still not sure about the Volition Reins blinking rules but if it works that will be a sick combo.
how goes the process? have you tried it out anywhere? fnm, casual?
I've been working on basically the same deck for a bit (Livewire Lash Infect, if you care to check it out). My spell count feels like it's getting a little out of focus, but yours seems to be tight. I like Mana Leak for early tempo control, but I'd ditch Spell Pierce from the sideboard. Maybe Preordain or Nighthaze (target creature gets swampwalk and you draw a card for one black mana - a card draw that adds another feeder for the Lash!), but it's all a crap shoot until we can play with it... Love Skith the Blight Dragon but he's a tad pricy for me (c'mon lucky draw!). Last things: Your air defense seems lacking for a set that came out with Plague Stinger and Thrummingbird among others, though Mana Leak, Grasp, and Necropede's death ability should help you control the field. I love the Tar Pits in this deck. Invisomancer is something I haven't considered yet since I'm trying to ensure Infect creatures for my Lash, but a 2/1 unblockable is pretty sweet.