I really like your critter combo of Auratog , Bruna, Light of Alabaster , and Mesa Enchantress . What a cool idea! I do think you'd do better if you added some more land, and switched out some of the Karoo lands. Having almost half (8/20) of your lands coming in tapped as well as sending a land back to your hand is going to slow you down a lot, and you really need to get Bruna out soon to make this work. I'd also consider maybe switching out Three Dreams for some sort of ramp, since Bruna costs six mana.

33% of your deck is enchantments. I don't think you need Three Dreams . Seems like a win more to me.

Also, you have to be able to win without Bruna, Light of Alabaster . If you play a game and don't draw into her, all 8 of your heavy casting cost auras are pretty much dead cards. I would remove at least 2 of each (or leave in a few Three Dreams and leave one of each of Eldrazi Conscription and Celestial Mantle in) and add more Ethereal Armor and Spirit Mantle .

Also, I would think that Hatching Plans is better here than Compulsion . And like PriestessKikyo1 said, you need more lands.

I think your deck would benefit from some more white sources of mana, as your coloring is a little off. maybe run 2x Temple of Plenty and 2x Temple of Enlightenment , while cutting 2x Temple of Mystery 1x Forest and 1x Island

I think 4x Bruna is a bit high, considering her CMC and the fact that she's legendary. Have you considered any creatures with bestow for this deck?

Ok, made the changes to the Land's and also swapped out 1 Bruna for an Eidolon of Countless Battles because it's bestow ability is awesome.

Thanks guys.