Grassland of Xeno

{t}: Add one mana of any color. Activate only
if Grassland of Xeno is a land.
As long as Grassland of Xeno is your active plane, during your turn, you may pay {3}. If you do, create a 3/3 green Alien Beast creature token with, "When this creature dies, gain 2 life." Activate this ability only once per turn.