Fallen Star

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