Devil Diabolos Zeta, Evil Awakened/Rulings

If your opponent has a multi colored creature then destroying that creature with Devil Diabolos effect is destroying one creature of any one of the civilizations of that creature. For example, If your opponent has an Aqua guard and a Melnia,Aqua shadow then you can destroy both in the sense that you are destroying a water creature when you destroy Aqua guard and a darkness creature when you are destroying Melnia.