Skettara, Bringer of Tomorrow

(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}: {u}{b}{r}
{4}, Sacrifice Skettara: Search the top four cards
of your library. Reveal a blue, 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.