Mineral Landscape

{t}: Add one mana of any color. If there is an
exiled card named Mineral Landscape with a
mineral counter on it , add an additional mana
of the chosen color of the mineral counter.
Any time you could mulligan, and Mineral
Landscape is in your hand you may exile this
card face up with a mineral counter on it and
choose a color. At the beginning of your first
main phase of the game, add one colored mana
of that chosen type.