Boseiju, Who Endures

{t}: Add {g}.
Channel {1}{g}, Discard Boseiju, Who Endures: Destroy target artifact, enchantment, or nonbasic land an opponent controls. That
player may search their library for a land card
with a basic land type, put it onto the battlefield, then shuffle. This ability costs {1}
less to activate for each legendary creature you control.