I've actually played against this, and it can get quite nasty, I actually had to board OUT my Thoughtseizes because I really couldn't afford the loss of life, as well as mulligan hands with too many painful colored mana sources.
There's a sorcery that makes 3 elves that has reinforce 3, I think it's worh inclusion. Also, go for a full set of Sentinels. I'd lose the Harbingers, too slow, and pack Wil-Leaf Cavaliers, allows for applying pressure earlier on. I don't like Nath's Elite very much, and I'm not sure what would Ranger of Eos be really good for, I think you could stick with 2, tops, and either pack Loxodon Warhammer as a win condition, or Primal Rage (or even both). The green spell that costs (2/G)(2/G)(2/G) is also nice, gives you a removal of sorts. Wolfskull Shaman comes to mind as well, and Bramblewood Paragon is a must. Last, I think you don't really neew the Mossworth Bridge, I think it's not worth it. But shouldn't you lose the white and consider playing Quillspike combo instead?