The Raven Queen

Indestructible
As long as your devotion to white and black is
less than 7, The Raven Queen isn't a creature.
Whenever a creature your opponent dies, exile it instead. When a creature is exiled this way you
may create a black revenant legendary token copy
of it named Champion of the Raven Queen.
—
"You will be a bulwark of my power in cold flesh."
- The Raven Queen