Margit, the Fell Omen

Vigilance, Lifelink
When Margit, the Fell Omen enters
the battlefield you become the Monarch.
If you are the Monarch, Margit, the Fell
Omen has Indestructible, and if an opponent would gain life instead they lose that life.
"Someone must extinguish thy flame. Let it be Margit the Fell."
— Margit, the Fell Omen