Dirty deck list for 1v1, however, don't expect to make friends in a multiplayer game. Although I don't think you will need many alleys to win with all the burn spells you have.
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I have been trying to put together a Roon deck for a while now; consider Perplexing Chimera for a sweet little control trick. Also Stonehorn Dignitary can help lock out an opponent consistently. If you have the bank account for it, Giled Drake is almost a must for a Roon deck, its value is unparalleled.
Sorry to keep at it, but imagine Rite on an eldrazi one turn then the next turn you Stampede targeting that eldrazi and just win the game. Fck it, Rite anything then target an eldrazi with Stampede and win.
Two things I would suggest; one being is take out Kiora, the Crashing Wave, I know she seems good but I found in practice , was left wanting after I played her(my deck is also creature based and wants to atk). Secondly I would make room for Overwhelming Stampede, and maybe a Mystic Tutor, for situation that it would be more valuable then Craterhoof Behemoth. But on a serious note, add that Overwhelming Stampede; I promise you will be happy drawing it every time.
I see you have Archetype of Imagination, may I suggest Stormtide Leviathan so you can enjoy the lock down.
I would recommend Vizkopa Guildmage. She is cheap, for what appear to be a budget deck, and will get you a larger difference in life each time you extort.
Overall though, I really like it. I like that you have the Drana, Anafenza combo going.
You might consider a couple Feat of Resistance in the sideboard. Exile, i would imagine, is going to be a relevant form of removal due to Hangarback so indestructible might not always cut it. Plus it gives a counter and i see you are down with the Scales. And dude, Hangarback Walker.
Good looking deck. I'm trying to build a B/G elf deck for standard myself, this is going to help me out a lot when i put mine together. I was just wondering why you chose Elvish Mystic over Leaf Gilder? I ask because I can't decide which I would like to use in my deck.