Consider Armada Wurm. His cost is high enough that the two white shouldn't matter. He plays really well with restoration angel, and fills the top of the curve out a bit better since you have all the ramp and mana dorks. I might take out one garruk and one prey upon for two wurms. Or even move the sigardas to the sideboard for when you play against removal.
If anything I think Wolfir Silverheart is my weakest big creature, don't get me wrong he is very good but the wurm might have just a little more synergy. I can easily take him out for Armada Wurm and discovered i almost never have problems getting white mana. also thinking to make Oblivion Ring main board instead of prey upon; mostly for Lotleth Troll . Also playing around the idea of Terminus in the side just in case. Worst comes to worst I can hard cast him.
With garruk, I just need him. With green sun gone he is my only creature fetch. also immune to board wipes against control.
Sigarda in the side is not a bad idea but I'll hve to see how my meta plays out in the shop.
Thanks for the comments.
hay man i just played like 12 games with this. im thinking about adding some champion of lambholt just cause that chick beats, also the m13 gurakk. the rogues passage was a brilliant insight, i never thought of that to prevent stalemates. But i think Populate is fudging to strong to ignore, certainly need to run some kind of populate cards. Rootborn Defenses is a good populate card as well as growing ranks.
any ways, thanks for the deck to test out with. good luck brother!
card:Trostani, Selesnya's Voice I think is the answer you are looking for. I think I will use her but her in the SB for the fast matches she is cheap has a good defense and but load of life gain with Thragtusk coming in and out. Not to mention token generation