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