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You should better go with something different than Reaweave. I see only two options to use this card effectively in your deck while fetching for an Emrakul or sacrificing Nahiri for a second one in response. Anything else seems a 6 mana waste even when splicing onto arcane ability you still need to spend 6 mana for it at least. A cheaper way to get your Emrakul out would be Polymorph or Proteus Staff that has the advantage to be reusable against Liliana of the Veil. There might also be better cards to cut important ones from your opponent when not successfully countered, exiled or removed that may happen what, once in over 10 games?
The goal would definitely be to control the board, then EOT cast one of your Arcane spells with Reweave Spliced. Then start your next turn with a hasty Emrakul. It's really just a for-fun deck.