REINHARDT DOSE NOT KNOW THE MEANING OF PLAY SAFE FOR HE MUST ENGAGE IN GLORIOUS COMBAT

As a Mercy Player, you really need three things when playing:
1. Dedication to heal your teammates and survive in battle.
2. The thought process of knowing when or when not to use your ULT.
3. The tolerance to deal with teammates who throw themselves in battle and don't come near you when they're low on health and are about to die.