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imo u r missing some more interesting cards.
your deck is really slow for breaking lands. a low creatures deck is a pain for you. or a combo deck will kill u faster.
first of all, consider inserting Birds of Paradise , Llanowar Elves and, maybe Fyndhorn Elves . to give some speed you also have Chrome Mox , Lotus Petal , Elvish Spirit Guide and Simian Spirit Guide .
thrid; there are so many creatures. your opponent will give up before you kill him, what you really need is to stop his game. Terravore , Argothian Wurm OR Shivan Wumpus are more than enough. i'd say its enough with 2-3 terravore. but you can always have 1 of each, in case sum1 uses Lobotomy on you with a Dark Ritual and a Lotus Petal , who knows lol. anyhow, creatures are last thing you need.
six; hmmmm Powder Keg or similar things are interesting for small creatures or low cost artifacts.