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I'm pretty sure Vela the Night-Clad wins on the spot as a blue secondary win empath 6 cmc target as compared to Sphinx or anything else.

As for 6 drops, I've been using Prime Speaker Zegana instead of Griselbrand, and I still run 1 Emrakul. I'm also running Tarmogoyf though-I only own 2 Baleful Strix-and personally don't like more...