Deathbringer Regent

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.

Jumpstart 2022

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

New Capenna Commander

Commander 2021

Commander 2017

Archenemy: Nicol Bolas

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

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).