The Celestus (MID-BF)

Legendary Artifact

If it's neither day nor night, it becomes day as The Celestus enters. : Add one mana of any color. , : If it's night, it becomes day. Otherwise, it becomes night. Activate only as a sorcery. Whenever day becomes night or night becomes day, you gain 1 life. You may draw a card. If you do, discard a card.