I love the mechanic of Mind Slaver because it brought a new form of control. I'd like to continue that idea with this little number.
Cranial Vise 4
Artifact
3,T,Sacrifice Crainial Vise to take control of target opponent's library until end of turn.
I've got you now!
What would the advantages of controlling an opponet's library give to you? You couldn't use somthing like demonic tutor it says your library not target libray. I trully can't think of a use for this. Even drawing cards you still draw cards from your library not your opponents library even if you do 'controll' it.