This deck is pretty killer
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3 manakin, 1 darksteel colossus, 1 eldrazi conscription
don't forget to add you lands
also since this deck is all about getting "Big" creatures out... Get bigger Creatures to maximize your goal/rewards. look here http://magiccards.info/query?q=c%21g+pow%3E%3D5+tou%3E%3D5&v=card&s=cname
here are cards that utilize all green decks with forest multipliers http://magiccards.info/query?q=o%3Afor+o%3Aeach+o%3Aforest+c%21g&v=card&s=cname
try cards that use mechanics like. For every forest you have you get X... since you will have all forests it will pay off big.
sideboard Plummet or Pistus Strike to destroy flying blue decks.
or Creeping Mold to destroy my single color mana ive been waiting for!! I like these better that Beast Within Deconstruct destroys an artifact for FREE!!
Keep Creeping Corrosion on your sideboard to take out artifact decks.
Beast within --- look for a card online that does the same thing without having to give me a 3/3 for free. Check out Bear Umbra http://magiccards.info/roe/en/177.html
Get 4 harrow! <--- great land grab for almost free. Explore is nice too Untamed might seems like it might fall in the same category of Trollhide and Savage Sillhoutte. You wont ever have the mana to make it useful.
Troll hide is the same as Savage Silhouette. Get more Umbra Totems.. those worked well
You dont need Buried Ruin because it brings back artifacts which is not important to you. Tumble magnet "Taps" which isnt needed if you want to trample through with big creatures. Prophetic prism is meaningless to a solid green deck. Savage Silhouette lets you regenerate for 2 mana(most likely spent on your opponent's turn) And since each turn you will be spending all your mana to cast big creatures you shouldnt have 2 mana left over to use for regenerate.