overwatch comps EXPLAINED

Don't know when or what to swap? Here's a guide explaining general playstyles in overwatch and compositions that best fit those. Drop your questions down below and i'll try to answer them!
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Songs:
Martin Landström - Turtleneck
• Martin Landström - Tur...
Letherette - Turn On
/ turn-on
Martin Landström - Lazy Art
• Martin Landström - Laz...