Bargaining With Chaos

As an additional cost to cast this spell you
must pay 10 life, unless you cast this when
you would have normally lost the game.
Create a 9/9 Legendary Chaos Demon with
Ward {p/c}{p/c} and Flying. If you cast this spell
before losing, Chaos also has "If you control
a creature any damage that reduces your life
total to less than 1 reduces it to 1 instead"