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 const {1}
less to activate for each legendary creature you control.