Angel of Time

Vigilance, flying
When you reach 0 life, instead, your life total is changed to 1, and you no longer take damage this turn. The next time you would have a turn, gain an extra turn after that one, then sacrifice Angel of Time. (If your life total reaches 0 again, when it has already activated, this ability is repeated.) (If Angel of Time is destroyed after your life total is changed to 1, and before the extra turn, you still gain the extra turn.)