Mono Green is very weak against any kind of counters or creature destruction. Even a good Discard deck would pick out all your decent creatures and send them to the graveyard. I would hardly recommend that you mix it with another colour. Therefore it is necessary to throw out some enchantments. This would make your deck more variable.
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Unfortunately. either Lightning Bolt or Howling Mine made it into the new edition. Otherwise I am pretty sure you would have a decent burn deck here.
I think scent of jasmine would really speed up your deck. Yor are only playing with white, that means scent of jasmine can bring you already in turn 1 , up to 12 lifepoints!