Maggy's Bow is a passive unlockable item added in The Binding of Isaac: Rebirth.
- Adds a heart container.
- Red hearts double their value in healing. Half red hearts heal for one full heart container, full red hearts heal two, and 1+1 free hearts heal four hearts of health.
- The Jar - Gives the ability to spawn infinite red hearts.
- Humbling Bundle - Turns all regular red hearts to 1+1 free hearts. The 1+1 free hearts still heal four heart containers.