how do mask of the mimic + emrakul triggers stack?

1. sac emrakul to pay for mask
2. mask goes on the stack
3. emrakul's shuffle goes on the stack
4. emrakul's shuffle resolves
5. mask resolves

or (_not_ what i want)

1. sac emrakul to pay for mask
2. emrakul's shuffle goes on the stack
3. mask goes on the stack
4. mask resolves
5. emrakul's shuffle resolves

?