Aselia, Death's Handmaiden

Flying, haste, first strike, protection from black and from red.
{r}: Creatures your opponents control get -1/-1 until end of turn. If a creature would die this way, exile it instead.
{b}{b}: Create a 1/1 black Spirit token with flying.
{p/b}{r}: Regenerate Aselia, Death's Handmaiden.
{b/r}{b}{r}{t}: Destroy all creatures and artifacts.