Sacrifice Children of Korlis: You gain life equal to the life you've lost this turn. (Damage causes loss of life.)
If your life total becomes 0 or less, you’ll lose the game before you can activate the ability of Children of Korlis.
The life you gain is based on the total amount of life you lost, not the difference in your life total from when the turn started. For example, if you lose 5 life and gain 3 life before activating the ability, the ability will cause you to gain 5 life, not 2.