the whole point of the deck as oringally made was to use Nacatl War-Pride + Bramblewood Paragon to get 4/4 trampling creatures equal to the number of creatures you control, which if your going against some mega token decks, basically kills everyone.
Sub combo Scuzzback Marauders + Bramblewood Paragon makes me have a 5/2 trample creature that can't die.
the Obsidian Battle-Axe is to give any warrior haste.
Marisi's Twinclaws, Goblin Razerunners, Goblin Sky Raider, Scuzzback Scrapper, Chameleon Colossus are alternative ways of winning as well as interesting creatures that are good enoght to force warths or other removal effects.
Brighthearth Banneret reduces the mana requirements for the entire deck, as well as is a nice reinforement card.
Llanowar Elves, Radha, Heir to Keld, Skyshroud Elf are mana accesseration, with skyshroud being a good filter to red.
Stonebrow, Krosan Hero is one of the first cards to catch my eye and thats why i have 2 of them, he made me start to dream of a deck filled with tramplers that attack and get bigger. (only down side is he is ledgendary)
Pinecrest Ridge, and Darigaaz's Caldera are the best "duel lands" i can get sadly, but they work quite well seeing as both do not enter the battlefield tapped.
as for incinerate, and Lightning Bolt i do not think i need to explain why burn is good.
manamorphose is in here for 2 reasons, one is that way i have 58 cards in a way, seeing as i pay basically nothing and draw a card. two is i get to shift mana if i get too many red mana sources and i need green, or visa versa. (last as filler because i knew there would be cards i would want to put in here, seeing as there were 4, and are now 2 you can image how the deck has evolved over time.)
Moment's Peace is there to buy me a turn or 4(it has flashback...)
Naturalize is a good form of controling most combos so it is useful to have atleast 2 in every deck that has green.
Harmonize is epic, i need say no more, any green deck that needs to fetch peices really does need atleast 2 in the deck, and this one definately needs to do that often.
Savage Beating, Fury of the Horde, Relentless Assault are all 2nd combat phase varents that allow me to go from ok, this deck is mean to omfg thats insane, using these cards i can get the core combo of Nacatl War-Pride + Bramblewood Paragon to go insane, and deal 2000 damage thus why they are needed in this deck.