Unholy Procession

Black creatures you control get +2/+1.
Whenever a black creature enters the battlefield
under your control, each opponent loses 1 life.
{2}{b}: Create a 0/1 black Skeleton Bird creature
token with flying.
{2}{b}{b}: Create a 1/2 black Skeleton creature
token with deathtouch.
{2}{b}{b}{b}: Create a 5/3 black Zombie Hydra
creature token with haste and menace.