Overwatch has four heroes classified as Support. Three of them can heal allies, however, out of them, Mercy is without a doubt most effective at it, unless healing multiple targets at the same time is required, in which case Lucio could be argued to be better.
The first ability Mercy has is a passive called Angelic Descent. When jumping off of high places, you can hold the Space key to slow your descent. Keeping it pressed, releasing and pressing it again could help you to throw off enemy aim and avoid taking damage while going down.
Your Left Shift ability is called Guardian Angel. When playing, you will see a notice around teammates that are in range of the ability. When you target them and press Left Shift, you will fly towards them, to quickly get in range and heal them, no matter where they are, unless you are actually healing someone else at the time. This ability has a cooldown of 1,5 seconds. If you get caught by an enemy, it’s probably best to look for an ally to fly to instead of trying to fight because Mercy’s damage output is simply miserable.
Instead of an E ability, Mercy has two modes for her main “weapon”, the Caduceus Staff. When she targets an ally and holds the Left Mouse Button, she channels a heal, which restores 50 health per second. Once the beam starts going, you don’t have to look at your teammate to keep healing them. It’s a good idea to check for flankers at that time. If nobody around you needs to be healed, you can hold the Right Mouse Button to provide your ally with a 30% boost to his damage.
If you find yourself alone vs. an enemy hero who’s not Mercy, you’re probably screwed, however, instead of rolling over and taking it, you can switch to your sidearm, Caduceus Blaster. This gun has 20 rounds, firing 5 per second. The bolts it fires don’t travel very fast, so a certain amount of prediction is needed if you actually want to hit something. The damage dealt by this blaster is 20, which is actually quite bad, however, you should remember that you’re Mercy. You’re not supposed to be dealing damage at all. If you do have to fight, note that accuracy is very important. Try to go for headshots to compensate for the low base damage of the weapon.
Mercy’s Ultimate is called Resurrect. It is… simply OP. When you activate this ability, you will… resurrect all dead teammates who are in range. They will be at full health and the same position where they died. This can provide a huge swing in your team’s favor in a fight, as your enemies might have used several Ultimates to bring your teammates down, only for them to get back up.
After getting revived, your allies will be briefly invulnerable and able to move, however, they won’t be able to attack or use abilities. This is both good and bad. For one, they won’t get mowed down immediately after getting resurrected, however, the shock value of a timely Resurrect will also be reduced. One cool thing you can do is using Guardian Angel to fly towards an ally and use Resurrect on the way, to complete a fadeaway revive.
Resurrect is one of the easiest Ultimates to charge because you should always have a target you can heal or damage boost nearby. Both modes of the Caduceus Staff charges your Ult. The thing to be careful of is that your Ultimate’s immense power makes you a priority target for the enemy team. Added to that, Mercy is like a helpless baby in a firefight, so defending you should be quite high up on the list of your team’s priorities. If you take damage in a firefight, try to find a safe place to hide in. After a short time, your health will start going back up.
Mercy is a team-reliant Support. When it’s protected, it’s benefit to the team is amazing, however, if the team doesn’t understand the value Mercy brings or just gets rolled over by opponents who are simply better, there’s not much you can do to swing the game. One thing is for sure, however. A good Mercy can make all the difference in the world when playing in an otherwise close game where opponents don’t have a healing Support.