Knull, King in Black

Indestructible
As long as your devotion to black and red is less than seven, Knull isn't a creature.

At the beginning of each opponent's upkeep, Knull deals 2 damage to that player unless they sacrifice a creature of their choice.

"You know the pain of All-Black, don't you? Well... now you've had the honor of being killed by its creator." - Knull