Nykthos, Shrine to Nyx is a rare Legendary Land card from Explorer Anthology 2 (EA2), collector number 24.
{T}: Add {C}. {2}, {T}: Choose a color. Add an amount of mana of that color equal to your devotion to that color. (Your devotion to a color is the number of mana symbols of that color in the mana costs of permanents you control.)