Returning any nonland permanent to an opponents hand can hinder them from building their board state
Casting Emrakul is exactly what you'll want to do since when you do, you get to gain control of an opponent's next turn, giving them an additional turn immediately afterward that they will control
Hexproof, on the other hand, only stops your opponents from targetting the equipped creature, meaning you're free to play as many combat tricks or buffing spells as you like
[165] It was decided that Pikachu would repeatedly say its own name in various intonations
Sharing is not one of them
Our main goal, first and foremost, is to not fall to the initial onslaught of Delver, backed up by Daze, Wasteland, and the deck specific equivalent of additional disruption, be it Stifle, Hymn to Tourach or anything else