Muh'rud, the Corrupter

Flying, infect
{b}{b}{g}{g},{t}: Target creature with one or more
-1/-1 counters turnes into a Corrupted black
Human 1/1 with "Whenever you play a creature
spell you lose 1 life and that creature takes -0/-1
as long as this card remains into the battlefield"
I hear his voice in my mind! I...I need that you die...