Cerberus, Chains of Death

Deathtouch, lifelink
When Cerberus, Chains of Death enters the
battlefield each player sacrifices a creature.
Whenever a player can not sacrifice they lose 3
life.
{1}{w}{b} Sacrifice a creature. Each opponent must
sacrifice a creature with power equal to or less
then sacrificed creatures power you gain life
equal to its toughness.