Legion of the Fallen

{2}{b}, {t}, Pay 1 life: Put a 2/2 black Zombie creature token onto the battlefield tapped.
Whenever a creature token you control dies, you may pay {2}. If you do, put a +1/+1 counter on each creature you control and you gain 1 life.
"At that moment, the undead took off their masks and through them to the ground. They wanted to reunite with their loved ones."
-The Theriad