White/Blue control isn't the only problem. I run a Naya deck similar to this one and Red/Black burn/discard wreak havoc on it. All it takes is for them to drop one of your lands or roast an elf and suddenly you can't play anything while they blast you with spells. In a straight up race to the biggest creature Green wins every time but unfortunately that's not how the game is played.
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Afraid not, no standard trampling for the time being. I have a hunch that Infect is going to dominate Standard for a while, until Wizards makes a card to punish your opponents for using it. Until then though, this deck should do very well. I'm a firm believeer that you can't really judge a deck just by the card list, not until you try it out. Strength of the Tajuru seems like it might not be that useful, being as you are only looking to do 10 damage, I would swap them for two more Vampire's Bite. Outside of that I have no suggestions for you.
I've always found that infinite mana is a waste of card space unless you have some way to use it all though.
You're probably right about the land, I just don't like it coming into play tapped if I can help it. I'll have to do some test runs to see how it works out with and without the Excavator and Terramorphic Expanse. I originally had Rampant Growth but pulled it out in favor of Enclave Cryptologist.
You have a point about the owl. Teferi, Mage of Zhalfir can help out if you can make some room for him in there. That guy can really ruin a bunch of decks too. I would also suggest adding in some way to shuffle your graveyard back into your library so you don't accidentally run yourself out of cards from drawing too much. Personally I like Elixir of Immortality but you could also throw in Reminisce. Both techically cost 3 to play its just a matter of which you prefer. Again, 2 would be enough for you with all that drawing.
Oracle of Mul Daya, Harrow and Cultivate do that too and the Baloth's won't be coming out for a while. By the time you get to turn 3 you aren't going to be wanting lands to come in tapped if you can help it.
I would add an alternate win strategy. If, for example, I run one copy of Emrakul, how do you kill me? Exile the graveyard before it can shuffle. Two copies of Relic of Progenitus should do the trick. With the amount of cards you should draw I don't think it would be a problem.
If you really feel like you need that W mana throw in 3-4 Sunpetal Grove. And either way I would take out Terramorphic Expanse. You have enough cards to get out the mana you'll need.
The big question here is does it work? If you get a good hand and manage to survive past turn 6 or 7 without being crippled beyond recovery you might have a chance but this deck is too slow and vulnerable to just about anything but a similar one. At least, for solo play. For duals though, if you have a partner who built their deck to work with yours, it could be good.