Noble Hierarchs are a bad idea. Not only do the Birds of Paradise generate any form of mana where the former generate only three, flying is a far greater advantage in this deck than exalted. Enchanted with Indestructability or Shield of the Oversoul, Birds of Paradise keep the skyline clear, a spot where many aura decks our vulnerable. Llanowar Elves could be handy in addition to the birds. The more creature mana producers, the better.
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Instead of four Hyena Umbras on the sideboard try two of them plus two Phytohydras. Not quite getting the Ajani Goldmane. Replace him with Garruk Wildspeaker, he fits the theme of the deck more, with the land untapping and all. Pariah and Indestructability paired is such a great combo. Big fan of the Aura Gnarlids and the Auratouched Mage/Eldrazi Conscription combo. Great deck.