Planewide Revelation

Gain control of X instants or sorceries in your opponents' hands and graveyards. If X is
10 or more, create X copies of a non-legendary blue or red instant or sorcery. If it
was blue and red, you have no maximum
hand size for half of X turns.
A scheming, yet repetitive plan by Bolas. The endgame will not end in defenseless Ravnica.