I think if you plan to see Merfolk, you have to go with Peacekeeper. I don't want to go the Peacekeeper route because I don't like Jace in this deck as much as in others, but it's one of the few ways you can get there well. I was very much against the White Splash, as I loved the red splash for REB's, but against Merfolk, you don't get there. Firespout is fine against Gobbos and Elves, but Peacekeeper, as Rich said, handles Emrakul and Merfolk. I also think we should be playing 4 Nought and 4 Dark Confidant.

Rich, do you plan to include MM in your build?

-Matt