Dawnbreaker + Phantom Assassin

Why this works

Jumping a lone support as Phantom Assassin often draws a quick response from their team. Dawnbreaker can turn that response on its head with Solar Guardian. By casting her ultimate on an initiating Phantom Assassin, she can arrive with a wide area stun and a burst of healing right as the enemy collapses. This sudden reinforcement provides PA with the health and breathing room needed to survive the initial burst, re-engage with her spells, and clean up the fight. Dawnbreaker’s arrival turns a risky solo pick-off into a calculated teamfight advantage.

This global threat allows Phantom Assassin to farm more aggressively and pressure lanes she otherwise couldn't. From the mid-game onward, the enemy team is forced to think twice before trying to punish her split-pushing. They have to commit enough heroes and lockdown to kill PA before Solar Guardian can land, or else the gank will backfire completely. This forces the opponent to play cautiously and gives your team more control over the map's tempo, creating space while your cores build their critical items.