Bernu, Traitor King

When Bernu Enters the battlefield, you become the monarch.
When Bernu enters the battlefield, choose a creature. When that creature's power is greater than Bernu's toughness, sacrifice Bernu and the chosen creature becomes a copy of Bernu except they don't have Bernu's flavor text, the printed text says this creature instead of Bernu, and they have their original power and toughness.
As long as you're the monarch you gain 1 life on