Zur, The Lich Master

Indestructible, Hexproof, Uncounterable
Your life total becomes zero.
You cannot lose the game.
Any time you would take damage, sacrifice a permanent, for each point of damage.
When you would gain life, draw a card
for each point of life gained instead.
When you have no cards in your library,
you win the game.
When this card is removed from play,
you lose the game.