Demilich

When Demilich enters the battlefield, if you cast it from your hand, your life total becomes 0. If
you didn't, you lose the game.
You don't lose the game for having 0 or less life.
You have no maximum hand size.
Whenever you would lose or gain life, draw that many cards instead.
When Demilich leaves the battlefield, exile it and create a token that is a copy of it.
Most liches forget why they sought to escape death in the first place. Knowledge.