This deck is a port of a relatively cheap Standard deck that actually performs well in Modern with a couple of additional creatures that are also extremely cheap.
This deck can win as early as turn 4 with the nut draw of Elf into Leatherback Baloth into Surrak (giving haste to itself) into Reverent Hunter (with haste from Surrak).
Elves give you an explosive start. Strangleroot Geist and Avatar of the Resolute both give you solid 2 drops that add 2 devotion for Reverent Hunter. Geist also synergizes with Avatar, pumping the Avatar if the undying has been triggered.
Boon Saytr acts as both a 3 drop that gives 2 devotion and a late game pump spell that can represent 4 damage out of nowhere. Leatherback Baloth is the workhorse of the deck, being a massive creature that wins fights with any other 3 drop in the format, and providing 3 devotion for Reverent Hunter and Aspect.
Surrak gives us late game. He's a 5/4 haste the vast majority of the time and can start making hasty Baloths or Reverent Hunters if he stays in play.
Collected Company synergizes really well with the rest of the deck, and grabbing Baloth and Reverent Hunter is the dream. It lets you restock after a board wipe and has the potential to massively impact the board.
Rancor adds an extra devotion and allows our guys to punch through small blockers like Squadron Hawks in Soul Sisters, various tokens, or little red things in the burn deck. Aspect of Hydra is our finisher, often times giving +5/+5 or more for a single green mana, allowing us to represent lethal out of nowhere.
The landbase for the budget version is simply 22 Forests because we don't need anything else. More expensive versions of the deck could include Fetchlands for thinning.
A more competitive version of this deck that splashes red can be found here: http://tappedout.net/mtg-decks/modern-gr-aggro/
It's worth it to note that although it rings up at 51 tix here, I got it for closer to 44, it seems to be overpricing Torpor Orb. The sideboard is completely optional as it really doesn't do much. One of the problems this deck has competitively is the lack of varied sideboard hate in green.
