The Cultist King

At the beginning of your upkeep, target player creates a 0/1 white goat creature token.
Sacrifice a creature: The Cultist King adds {c}{c} to his or her mana pool. Any player may activate this ability. If revealed ally activates this ability, that player gets a devotion counter.
When a player gets his or her tenth devotion counter, you and that player both create a 5/5 black zombie giant creature token.