Mists of Darkness

({t}: Add {u} or {b} to your mana pool.)
Mists of Darkness enters the battlefield tapped.
When Mists of Darkness is put into a graveyard from the battlefield, you may search your library for a Island or Swamp card and put it
onto the battlefield. If you do, shuffle your library.
"And there was not any light seen... for so great were the mists of darkness."
3 N 8:22