Rak'zox, Twisted Hellscourge

{4}{b}: Target creature gets -5/-5 until end of turn.
Dreadful (This creature can only be blocked by creatures with total power greater than or equal to this creature's toughness.)
Headhunter (Whenever this creature attacks, target legendary creature defending player controls blocks this creature if able.)
Menace (This creature can't be blocked except by two or more creatures.)