Zaheer, untethered

When Zaheer, untethered enters the battlefield, if you don't already have a p'li, ghazan, or ming-hua
Card in your hand or on the battlefield, you may search (once per turn.) Your library for either
Ming-hua, P'li, or a ghazan card. Breathtaking: {t}{3} destroy target creature and You lose 3 life.
If said creature is legendary, you may destroy 1 artifact or enchantment. You may activate this only once per turn.