Tombs of the Star Corridor

{t}: Add {g}

Channel — {1}{g}, Discard Tombs of the Star
Corridor: 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.