Erasgh, the Dusk Brume

Erasgh, the Dusk Brume can't be blocked if a creature died this turn.
{1}{b}{b}, Pay 2 life, Sacrifice a creature: Return Erasgh from your graveyard to the battlefield. It gains haste until end of turn.
"I'll let you in on a secret, little honey bee: stabbing at the mist doesn't make it bleed."