Rare Mind Control. Pretty underwhelming to open, but it's at a better rate than most Mind Control effects lately. The high destruction cost usually means you'll get some use out of the creature when you cast it, even late game (or at the most just force them to spend 7 mana to get their best creature back). It's also at 4 mana so you can't get it back with Three Curses, for Constructed power level concerns. Not sure if that's necessary though, I'm tempted to change it to for cast and for destruction.