Ruin of the Undead

Whenever a creature you control dies, create a
2/2 black Zombie creature token.
Reclamation Squad {b}{b}{b} - As long as you have
six or more creatures, you may pay {b}{b}{b} and
exile Ruin of the Dead, then cast it transformed. Activate only as a sorcery.
Many ruins were remained unexplored during the
longest apocalypse cycle ...