Strategies
Abilities and Ultimate
Wraith Form
Cooldown: 8 seconds
Move faster and become invulnerable, but you cannot shoot.
Shadow Step
Cooldown: 10 seconds
Teleport to a targeted location.
Death Blossom (Ultimate)
Needs to be charged
Damage all nearby enemies.
In case the video won't load here's the external link.
A Guide for the Hero Reaper from Overwatch
The narrator talks about the hero generally then summarizies it's abilities and how you can use the effectively in the most precise but shortest way. In the background there are clips from the game, possibly it's the narrator's gameplay. He talks about against which heroes can and can't be this specific hero be used.