The Celestus

If it's neither day nor night, it becomes day as
The Celestus enters the battlefield.
{t}: Add one mana of any color
{3}, {t}: 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.