Margit, the Fell Omen

At the beginning of your upkeep, the Ring
tempts you.

When Margit the Fell Omen dies, if you
control a Ring-bearer, return Margit onto the battlefield transformed.

"Foul Tarnished, In search of the Elden Ring.
Emboldened by the flame of ambition. Someone must extinguish thy flame. Let it be Margit the Fell!"