Sarhath, the Devourer

Menace
Whenever Sarhath, the Devourer attacks, you may sacrifice a creature. If you do, createa 2/2 Zombie creature token, and Sarhath gets +1/+0 and gains trample until end of turn.
{b}{b}, sacrifice a creature: Create a 2/2 Zombie creature token.
{p/b}{p/b}, pay 3 life: Create a 2/2 Zombie creature token.