Undead Uprising

When Undead Uprising enters the battlefield,
create three 2/2 black Zombie creature tokens
with Decay 3 (This creature enters the battlefield
with three decay counters on it. At the beginning of
your upkeep, remove a decay counter from this
creature. If you can't, sacrifice this creature.)
Whenever a nontoken creature you control dies,
you may pay {2}. If you do, create a 2/2 black
Zombie creature token with Decay 3.