Nissa, of Raging Wilds

+1: Until the end of turn, lands you control produce double the amount of the color of mana they would produce when tapped.
0: Until the end of turn, target land you control becomes a 4/4 Elemental creature with trample and haste. Untap it. It's still a land.
-4: You get an emblem with: "Creatures you control are also basic Forest and Mountain lands. When you tap them, you gain 1 life."