I would drop the BoPs and add more infect creatures. You aren't casting anything more than 3 cmc, one of which is an artifact, and running 4 Wilds I don't think you will be short on land. Corpse Cur's would also be a good addition as they can bring back some fallen infectious critters..
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It didn't have the Necro, I dropped the the two myr types and added it and Corpse Cur in.
Also thought about dropping the Vector Asp and throwing in Tainted Strike to use on the tar pit. Thoughts?
The idea behind that was to have the Silvers for mana boost and Galvs to keep the Silvers untapped for mana source and Ichorclaws untapped for blockers, but I see your angle. Changed to Necropede and Corpse Cur, since once the Cur bites the bullet it fetches an infect creature out of my graveyard.