Since you're running green anyways I'd suggest running Naturalize over Ancient Grudge so you can remove enchantments also (boosting ones such as honor of the pure, and curses are particularly nasty). It's better to run Ancient Grudge sideboard in case they have a lot of artifacts or mill so you can flashback. And judging by the 10 sample hands I did, you may need to work on balancing the lands. It's too often that a Rootbound Crag or 2 are drawn and no Forest or Mountains. Also, since you're running green anyways you might as well run Mutagenic Growth as well. Cheap boost on your creatures that can still be played with all your mana tapped to trick your opponent into allowing extra damage.
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Viral Drake is a good addition with infect and can proliferate, plus its hard for others to kill with 4 toughness. And if someone does try to block him because he's only a 1/4, using twisted image to make him a 4/1 gives you a nice boost. I've done it many times.
It looks nice, just wondering why no piston sledge or throne of geth? And I would suggest running 4 woodland cemeterys to make your mana a little more efficient. Dual lands are always a plus.
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