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.