Count Olaf

Hexproof, double strike
Whenever Count Olaf attacks defending players lose 3 life unless they sacrifice a creature. If Count Olaf is blocked regenerate it. (The next time this creature would be destroyed this turn, it isn't. Instead tap it, remove all damage from it, and remove it from combat.)
{t},{w}{b}, Sacrifice a creature: Target player sacrifices half their hand at random.