Zarethrax

Flying, Trample, Protection from White
Demons you control get +1/+1 and have Shadow.
{b}: Sacrifice a creature and add {b}{b}{b} to your
mana pool
{b}{r}: +1/+0 until end of turn
{b}{b}{b}{t}: Destroy target White card

"Zarethrax the Shadow Sovereign, One of the 6 Demon Lords to hold a seat at the Blood Table."