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.