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I've never used it, but is {Black Sun's Zenith} really all that useful here, given the size of your creatures?  I could see doing it for 1 and proliferating, but {Blighted Agent} is a pet card of mine, and it seems like you'd want more {Hand of the Praetors} to help your little guys survive.

Also, {Cancel} probably shouldn't be in here, as others have said. {Fuel for the Cause}  does two things at once and would be better late game, and  cancel is two expensive early on.  You might want to take a look at {Corrupted Resolve}, if you cand get blighted agent running fast.

{Gerbil Prophet}

I findSskin Render to be better because he's just as easy to return, and still is viable outside of a deck with easy reanimation.  With Rotting Fensnake, he really needs reanimation to be useful as more than a blocker.  Now if I had a {Skeletal Grimace} in hand the fensnake would be my first choice, other than a {Cemetary Reaper} for a target. Rotting Fensnake is great if you can find a way to keep him around, but I find Skin Render more useful because he has a permanent effect on the board, even if he dies.