Angelus Ex Machina

Split second (As long as this spell is on the stack,
players can't cast spells or activate abilities that aren't
mana abilities.)
You can't lose the game this turn and your
opponents can't win the game this turn. Until
end of turn, damage that would reduce your life
total to less than 1 reduces it to 1 instead.
We can shrug off even weapons of mass destruction.