Hellmaw, Eternally at Chaos

{t}: Add {r} to your mana pool.
{r}{t}: Add {u}{u}, {b}{b}, or {u}{b} to your mana pool.
{u}{b}{t}, Sacrifice Hellmaw Eternally at Chaos:
Look at the top three cards of your library put
them back in any order then draw a card or
destroy target tapped creature.
A world rumored to be the birthplace of the Kerz...