Crystal Skull

{1}, {t}, Discard a card: Add three mana of any
one color. You lose 1 life.
If your life total would be brought to 0, instead
sacrifice Crystal Skull and X lands. You gain X
life. Then, shuffle your hand and graveyard into
your library and draw X cards.
Whoever owns the skull is blessed with immortality,
and cursed to meet their end at the hands of another.