Sweep Away, Hemorrhage, and Unknown Shores are all fine picks here. Would take the shores if we had something like a blinding drone, but we don't so our first sweep away seems fine.
Kozilek's Shrieker, Null Caller, Sweep Away and Unknown Shores are the cards that stand out to me. My analysis:
Kozilek's Shrieker: Definitely a solid addition our deck. It has good stats for the fail case, although we have to start picking up some more colorless sources to maximize our usage.
Null Caller: Stats are ok, but its ability is on the slow side.
Unknown Shores: At this point, I don't think we need too many colorless sources, so I'm fine passing this.
Sweep Away: The tempo swing is huge that I classify the first Sweep Away in the removal-priority region.
My pick is also Sweep Away, though I'm open to further debate.
Picks so far:
P1P7:
Foil
Kozilek's Shrieker: Definitely a solid addition our deck. It has good stats for the fail case, although we have to start picking up some more colorless sources to maximize our usage.
Null Caller: Stats are ok, but its ability is on the slow side.
Unknown Shores: At this point, I don't think we need too many colorless sources, so I'm fine passing this.
Sweep Away: The tempo swing is huge that I classify the first Sweep Away in the removal-priority region.
My pick is also Sweep Away, though I'm open to further debate.