Khaz-Urabia, Glorious Depths

(This Civilization's ability costs are reduced by {1} for each creature on your side of the field that
shares a color type with mana this land can produce.)
{2}, {t}: {w}{b}{r}
{4}, Sacrifice Khaz-Urabia: Search the top four
cards of your library. Reveal a white, black, or
red spell from among those cards, and put that
card in your hand. Put the rest of the cards on
the bottom of your library in any order.