Summercalling

Choose a color, then choose another color. Shuffle each tapped basic land of the first chosen color that you control into your library, then search your library for an equal of basic lands of the second chosen color and put them onto the battlefield tapped.
"Despite all that the wanderer had seen, the changing of the seasons never failed to spellbind Oraduk Rai."
-The Saga of Oraduk Rai