Immortality

When Immortality enters the battlefield, exile target creature you control. Then put target creature from your graveyard onto the battlefield and enchant that creature. Enchanted creature becomes a copy of the creature exiled when this card entered the battlefield.
If enchanted creature leaves the battlefield put target creature from your graveyard onto the battlefield and enchant that creature. If there are no viable creature cards in your graveyard, exile Immortality. Immortality also has the subtype "Heritage".