The first thing I'd look at improving is the mana base by getting the better dual lands in there, so that sometimes they'll come into play untapped.
You on have one Emrakul, and it will reliably be 8 and occasionally 7 to cast. I'd look at changing some of the removal to
choking restraints so you can remove their creature, then get that enchantment into the yard to help make casting for 7 a more reliable plan. The backup of using Briarbridge or Journal to put it in play is nice, but you'll lose the cast trigger to take their next turn.