Instability: Passes to a target opponents control at the end of your turn. Library X: When ~this~ comes into play, put X target card(s) from your hand aside, removed from the game, during your discard phase set X card(s) in your hand aside from the game. If you cannot, sacrifice ~this~ and put all cards set aside into your hand after discarding your current hand. 0: Sacrifice ~this~. Remove your hand from the game. Put all cards set aside into your hand. If you believe that library is broken I believe that 3 or 4 colorless mana should be added to the normal casting cost of the card.