Faetouched Marsh

As Faetouched Marsh enters the battlefield,
you may have it become an aura with 'enchant
land you control.' If you don't, Faetouched
Marsh enters the battlefield tapped.
Whenever enchanted land becomes tapped
for mana, it's controller adds an additional {b} or {g}.
If Faetouched Marsh isn't an aura, it has,
"{t}: add {b} or {g}."