It's called Exchange of the Spirit and it is super-banned.
Maybe because IT SWITCHES THE CARDS IN YOUR DECK WITH THE CARDS IN BOTH YOU AND YOUR OPPONENT'S GRAVEYARDS. Seriously. There are so many bad things that could come of that. For one, you have the FTK where you combine it with a crapload of drawing cards and wait til your opponents turn and activate it so that they cannot draw their next turn. You have to have 15 cards in your grave to activate it. Hell, add in Makyura the Destructor and you can beat them before they even have their turn. It's a broken card.