Rulings

• If you cast a creature spell that enters the battlefield as a copy of Deathbringer Regent, the enters-the-battlefield ability will trigger (assuming the “five or more other creatures” requirement is also met).2015-02-25
• Deathbringer Regent's last ability destroys all creatures except Deathbringer Regent, including the five other creatures required for the ability to have an effect.2015-02-25