(Swamp Ampitheater isn't a spell.)

Swamp Ampitheater enters the battlefield tapped unless you pay .

Swamp Ampitheater is indestructible. (Destroy effects and lethal damage don't destroy it.)

, Pay 1 life, Sacrifice Swamp Ampitheater: Search your library for a Swamp or Mountain card and put it onto the battlefield, then shuffle your library.