Tracer + Sombra combo?

Sombra can hack the HP Packs for Tracer in the back lines for extra survivability

they both can Harras the enemy a lot, leading into a teamfight where half of them is focused on Tracer + Sombra while the rest of the team cleans up.

they both also have insane DPS to 1 clip anyone in the back lines.

how would this combo turn out?