Harbingers and smokebraiders stack your deck and power out early Hostility, protected by delays. Scattering stroke serves as another way to get a turn 5 hostility if your smokebraiders get whacked.
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Excellent suggestion on reducing the Urborgs. I don't have much need for dig or tutors once the seers are online. I'd stil like to have 2 Urborg in there and I'd up the swamp count to make up the diff in black mana.