Being perfectly honest, you already have Asceticism, so I would remove the Drove of Elves and the Plated Slagwurm in favor of 4 Immaculate Magistrates. I would also remove the Nissa's Chosen in favor of Some Fyndhorn Elves and/or some Wellwishers. If nothing it will help balance the averages of the overall converted mana cost. Not to mention with the Immaculate Magistrate, your Joraga Warcallers will be that much more effective. Also you can use Nissa Revane to focus on life gain rather than searching for elves that will come much more easily.
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