(Plains Tomb isn't a spell.)
Plains Tomb enters the battlefield tapped unless you pay 1 life.
, : Scry 2.
, Pay 1 life, Sacrifice Plains Tomb: Search your library for a Plains or Swamp card and put it onto the battlefield, then shuffle your library.
, 
: Scry 2., Pay 1 life, Sacrifice Plains Tomb: Search your library for a Plains or Swamp card and put it onto the battlefield, then shuffle your library.
