King's Landing, Seat of Power

When King's Landing enters the battlefield,
choose a color, then you become the monarch.
{t}: Add one mana of any color except the chosen
color to your mana pool.
The morning air was thick with the old familiar stinks
of King’s Landing. She breathed in the scents of sour
wine, bread baking, rotting fish and nightsoil, smoke
and sweat and horse piss. No flower had ever smelled
so sweet.