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Conduit of Ruin? It's cast trigger searches for a big Eldrazi (costing 7 or more) and reduces the cost of your first creature cast each turn by {2}. With all the colourless ramp you have, casting Conduit on turn 4-5 should be easy which means you could have a turn 5-6 Kozilek.
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You know, I totally forgot about Conduit. Now that you mention it. Running it as at least a 2-of in place of Oblivion Sower and something else seems like a solid idea.