Spring Bloom

All lands you control produce one additional
mana of the same type it originally produces.
If a land produces more than one color mana,
you may choose any color of the same type it is
producing.
For example, if a land added both {u} and {r},
you can choose {u} or {r} as the additional mana.
If a land has the option to produce {b} or {g}, but
it produced {b}, then it produces an additional {b}.