Dragon Orb

Dragon Orb costs one less to pay for each different color used to cast it. All dragons enter play exerted. All dragons in play lose flying and have -5/-5. {5}, {t}: Gain control of target dragon for as long as Dragon Orb remains tapped; you may choose not to untap it. Do this at sorcery speed. Sacrifice Dragon Orb: Destroy target dragon; it cannot be regenerated.{flavor}The last of several powerful artifacts created by a powerful wizard of every school.{/fontsize19}