Submerged Mushroom Forest

{t}: Add one mana of any color. Activate only
while Submerged Mushroom Forest is a land.
Landfall — Whenever a land enters the
battlefield under your control, create a 3/3 green
and blue Fungus Elemental creature token.
As long as Submerged Mushroom Forest is your
active plane, basic lands you control and in your
hand are coast lands in addition to their other
types.