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Built around Grand Architect. Turn 3 Steel Hellkite, Contagion Engine, etc. fairly easily. The tower of calamities is surprisingly easy to activate, given you can tap each creature you control for 2 mana for its cost. I'm using mini jace because big jace is too expensive for me to even think about getting, and also, proliferation via the engine will normally keep him alive without needing to make your opponents draw cards too. Proliferation with the Grand Architect is incredibly easy, and if you get out one or two Lux Cannons, it's pretty much over.
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