Primordial Rift

At the beginning of each upkeep, you may sacrifice Primordial Rift. If you do, search your library for up to two basic Mountains, put them ont the battlefield, then shuffle your library. Sacrifice them at the beginning of the next end step unless you control a card named Koth, Defiant Earthshaper.
"The miracle of creation isn't always smooth and bright. It is always beautiful, though."
-Koth