Deathbringer Regent — ruling 1

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).

Deathbringer Regent — ruling 2

Deathbringer Regent's last ability destroys all creatures except Deathbringer Regent, including the five other creatures required for the ability to have an effect.

Deathbringer Regent : règles, fonctionnement et interactions (MTG)

Deathbringer Regent is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Flying When this creature enters, if you cast it from your hand and there are five or more other creatures on the battlefield, destroy all other creatures.

How it works : Deathbringer Regent

Original English text — Wizards of the Coast / Scryfall

#1February 25, 2015· Wizards of the Coast
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).
No other card is named in this ruling.
#2February 25, 2015· Wizards of the Coast
Deathbringer Regent's last ability destroys all creatures except Deathbringer Regent, including the five other creatures required for the ability to have an effect.
No other card is named in this ruling.