If it resolves, you'll follow its instructions and the targeted opponent will mill half of their library
(9/15/2013) When you scry, you may put all the cards you look at back on top of your library, you may put all of those cards on the bottom of your library, or you may put some of those cards on top and the rest of them on the bottom
No, rulebreaker doesnt change your commanders color identity
And lastly, Living Twister is incredibly hungry on colored mana for very little payoff you are almost never going to want to use the discard a land ability
That action doesn't use the stack and can't be responded to
Cards like Black Lotus, for example, which generate three mana for zero investment, offer an unparalleled tempo advantage that defines the pinnacle of the MTG power level