-------------Caution: This Deck will generate obscene amounts of MANA.------------
Stack landfall triggers to empty your library into exile to deal damage with Valakut Exploration.
That's the main premise behind this deck. How you get there is up to you.
You need to prioritize mana production so that as you exile cards from the top of your library you have the resources to cast them.
The extra mana production will help you ramp out Ancient Greenwarden.
With Ancient Greenwarden in play Lotus Cobra and Tireless Provisioner generate 2 additional mana with each land you play.
Valakut Exploration expands your hand with every land you put into play the more lands you play the more cards become available for you to play.
With Ancient Greenwarden or Crucible of Worlds in play all the lands you sacrifice with "Nihiri's Lithoforming" can be replayed to immediately generate mass landfall triggers.
When opportunity presents itself expand your ability to play more lands by casting "Azusa Lost but Seeking", "Dryad of the Ilysian Grove" or "Druid Class".
You have some built in disruption with Bosejiu, Who Endures and Dire-Strain Rampage.
As and alternate win condition you can use "Valakut, the Molten Pinnacle" with "Dryad of the Ilysian Grove", "Nihiri's Lithoforming" and Gruul Turf you have the ability to quickly stack up huge amounts of damage.
-------------Caution: This Deck will generate obscene amounts of MANA.------------
I keep refining this list based on how I see it interacting. This is not a Scapeshift deck neither is it a traditional Valakut deck. This deck list works by leveraging ramp spells and landfall triggers to combo out with Valakut exploration. It's easy to say that Scapeshift is "better" than Nahiri's Lithoforming except that Scapeshift doesn't draw additional cards and forces you to play lands only out of your library. The power of Nahiri's Lithoforming comes from the fact that you can play X additional lands this turn where X is equal to how many you sacrificed. With the addition of Drawing X cards you now have refreshed your hand and can generate mana through landfall triggers allowing you to advance your board state from both your hand and card exiled with Valakut Exploration.
After just a couple of Monday night matches at my LGS I can say that when this deck does fire off it does so in a very satisfying way. The deck is very capable of scooping wins seemingly out of no where. I have learned not to overlook the third level of "Druid Class" as it can quickly turn the tide by creating a 5/5 or bigger hasted creature. Valukut Exploration is very hand at digging for threats and combo pieces the additional few points of damage that is also dealt is helpful as well. I still keep Scapeshift in my side board as an additional win con in case I need to shift my strategy due to over the top graveyard hate.
Still building out the side board as I don't have enough data on matchups. So far the matchup with mono-green tron seems not to bad. Keeping their mana base disrupted is the key to that one. Bringing in Ghost Quarters against tron would probably be the best route.