Dark Heart of the Forest

Pay 2 life, sacrifice a creature: Add one mana of any color. If a creature you owned and controlled named Loyal Companion was sacrificed in this way, exile Dark Heart of the Forest and that card from your graveyard, then return them to the battlefield melded under your control.
The demonlord Griselbrand may no longer pose a threat to Innistrad, but his dark soul still leaves a taint at the edges of the world.