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.