Form of the Demon

When Form of the Demon enters the battlefield,
your life total becomes 0. If you have no cards in
hand, draw seven cards.
You don't lose the game for having 0 or less life.
At the beginning of your upkeep, up to two
creatures get -13/-13 until end of turn. If a
creature dies this way, draw X cards and lose X
life where X is that creature's power.