(Grass-of the Burnwillows isn't a spell.)

Grass-of the Burnwillows enters the battlefield tapped unless you reveal an artifact card from your hand.

Grass-of the Burnwillows is indestructible. (Destroy effects and lethal damage don't destroy it.)

, Pay 1 life, Sacrifice Grass-of the Burnwillows: Search your library for a Mountain or Forest card and put it onto the battlefield, then shuffle your library.