Banish 1 Zombie monster from the field, then Special Summon 1 Zombie monster from the GY of the player who controlled it, to their field in Defense Position. If this card is in your GY: You can shuffle 1 of your banished Zombie monsters into the Deck, and if you do, Set this card, but banish it when it leaves the field. You can only use 1 effect of “Return of the Zombies” once per turn.