Macashi Lifecurer

{1}{w}, {t}, Discard a card: Prevent the next 3 damage that would be dealt to target creature this turn. You gain life equal to the damage prevented this way.
Substantiate —Whenever Macashi Lifecurer becomes tapped, if it's not attacking, prevent the next 3 damage that would be dealt to it this turn. You gain life equal to the damage prevented this way.