What is the point of
Field of the Dead or
Nykthos, Shrine to Nyx?
Field of the Dead is useless because you haven't 7 lands with diferents names and Nykthos only gives you one mana, because its second ability gives you no mana. You have to chose a colour. Colorless is not a colour, so, as all your permanents are artifacts or colorless, you have devotion 0.
And is very nice of you fix the mana of your opponents with
Urborg, Tomb of Yawgmoth if they need black mana. What is the point of include it if you have nothing in the deck that counts swamps or have swampwalk or somethin like it? Do you include only for 2 useless lands that add colorless mana in a deck with all permanents are colorless?