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Ghostly prison, norn's annex, windborn muse, and especially sphere of safety will make you virtually untouchable by your opponents. Meanwhile ethereal armor will buff a creature like crazy if you have a few enchanments out which can make champion of lambholt unblockable (or any creature if you add spirit mantle). Pacifism in there as a safety cushion.
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I feel like white blue would be better for this type of thing (cause propaganda) but thats not modern. Anyway might i suggest echantment creatures from theros? They are better than some of your creatures here and they are situationally better than spirit mantle. Also I would play oblivion ring over pacifism. Because chances are they already won't be able to attack you.
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I agree about oblivion ring. Though it seems it would ger hurt a bit before the sphere of safety id run a set of idyllic tutor as well. it lets you search for the spheres or any other enchantment
Also i run a deck kinda similar to this you might get some more ideas off it. G/W great walls assault its more expensive build but i haven't had many problems with it check it out