The owner of this deck hasn't added a sideboard, they probably should...
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Hopefully, this deck will get mana quickly and will allow you to play Mayael's Aria with a combination of Protean Hydra with a power of 20+ to instantly win the game. If that doesn't work, it will still get out some large creatures.
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You can add cards with the proliferate ability, like Contagion Engine, to increase the +1/+1 counters. You don't have that many low cost creatures (but I see you have added some Kodama's Reaches and Knotvine Mystics) which is a good idea, but even the those cost 3 mana which can take some time to get to. I'm not really to good either but I would recommend adding some more lower cost creatures in your main deck and some cards that help against flying creatures in your sideboard. Check out my ally deck: http://mtgvault.com/ViewDeck.aspx?DeckID=128563
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Edit: Did not mean to say that a low amount of low cost creatures was a good idea.
Here's a card I've been wanting to use to 'cheat' my way to win with Mayael's Aria: Mossbridge Troll