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