Dryadic Evolution

{2}{g}, Sacrifice a land: Put a verse counter on
Dryadic Evolution, then search your library for a
creature card with mana value equal to the
number of verse counters on Dryadic Evolution,
put it onto the battlefield, then shuffle. That
creature is a Forest land in addition to its other
types. (They're affected by summoning sickness.)
"Just as the trees replace themselves after a fire, we,
too, rebuild our society."