The Matron of Ravens

Indestructible

As long as your devotion to black is less than three,
The Matron of Ravens isn't a creature.

At the beginning of each opponents upkeep, that
player may roll a d4. If they dont, they lose 5 life
and discard a card. You and that player each create
a number of treasure tokens equal to the result.

Your opponents cant gain life.