MAGIC: THE GATHERING
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.
Used alongside Phyrexian Unlife in Modern Ad Nauseam as a way to negate the downside of Ad Nauseam. If you can't lose the game this turn, losing a ton of life to draw your entire deck doesn't seem so bad.