So, this is more of a suggestion than a polished deck, but I'd appreciate advice on the idea.
The basic line of thought is that Garruk Wildspeaker could work well in a deck with the Stax shell (Trinisphere, Crucible of Worlds, Chalice of the Void, Smokestack, etc.). Additionally, it seems like Garruk could create some really one-sided situations in conjunction with Winter Orb, but I'm not sure if the Orb is good in this format. With Winter Orb down though, Garruk would let you untap three lands per turn as opposed to your opponent's one land. Also, Garruk gives you an additional win condition with his elephant tokens, although it's sort of slow.
Does anyone play a Green Stax build these days? Is green just really not the right color or something?