Eretra, Princess of Death

Whenever a player loses life, create a 2/2
black and red Zombie creature token with
menace.
Eretra, Princess of Death gets +1/+1 for each
Zombie you control.
When Eretra, Princess of Death dies, create X 2/2
black and red Zombie creature tokens with
menace, where X is Eretra's power.