{T}, Sacrifice Fabled Passage: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle. Then if you control four or more lands, untap that land.
If you control four or more lands, the basic land doesn't enter the battlefield untapped; it enters tapped and then you untap it.
The land that you put onto the battlefield will be counted when determining whether you control four or more lands, but Fabled Passage will not.