Bwonsamdi, Loa of Souls

Indestructible, hexproof.
If you would lose the game, sacrifice Bwonsamdi,
Loa of Souls. Your life total becomes one and Bwonsamdi, Loa of Souls becomes an
enchantment with "You may cast creatures from
any graveyard and you may spend mana as though
it were mana of any type to cast that spell, they have
haste"