Feyun Krah, Dark Queen

When Feyun Krah, Dark Queen enters the battlefield, each player sacrifices a creature.
{b/g}{t}: Put a */* black and green Fel Wolf creature token onto the battlefield. It has Deathtouch and "This creature's power and toughness are each equal to the number of creature cards in all graveyards."
{b/g}{b/g}: Sacrifice a creature.