I would think about adding a Mondronen Shaman or two. Once that puppy is transformed it really makes your opponent squirm!
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Ah I missed the fact that it was a pure green deck! Well I do recommend adding some red in there. Armillary Spheres are cheap enough to help you search for any lands that you may need :) Still a great deck though, Werewolfs are superb!
If you want to run a werewolf deck I highly recommend getting a few Immerwolfs and some Mondronen Shaman. The Mondronen Shaman is pure evil and is fantastic in this deck, as is the immerwolf ability to stop your werewolfs from transforming back into humans. Also a cheeky combo I like to whap out is blasphemous act with the full moons rise. Completely wipe the board and regenerate all of your wolfs.
Glad I could help!
I think this deck looks great. The only card that I can think of that could help is moonmist since its nice and cheap to cast.
I think curse of the nightly hunt could work well in this deck. It forces your enemy to attack you so you can then block with your undying creatures? It could work!