Vorthos, Compleat Bolas Fan

Companion—Each card in your starting
deck references Nicol Bolas or Phyrexia in
its name, flavor text, or art.
{u}{b}{r} mana costs may be spent
as though they were phyrexian mana.
"The gills on the back of Deepglow Skate
look exactly like Bolas' horns, it counts!"