Right now, that song is Comics by Caravan Palace.
Last week, for the record, it was Six Shooter by Coyote Kisses.
Which, I agree, would make an awesome clip show. That's how I found it - this amazing Mercy montage:
And, for the record, I have every intention of using that show for a much lesser clip show of my own design.
Annnd now I'm signin' off 'till Microsoft's conference.
Oh! And someone created a GIF of exactly what it feels like to try to heal you in Overwatch.
THIS IS IT.