Dragon's Nebula

Flying
When Dragon's Nebula enters the battlefield you
lose 5 life.
{b}{t}: You lose 2 life.
Damage dealt to you by creatures is halved.
Whenever a player draws a card, you gain one life.
If Dragon's Nebula were to die, return it to the battlefield tapped under your control.
Instant/Sorcery spells cost {4} more to cast.
If your life total would ever get to 0 or under, you
win the game instead.