Volibear & Zed Synergy
Volibear Top and Zed Mid win 49.1% of 4,249 Low Elo games together, -0.0 points vs expected, 2-patch window 26.19-26.20.
Researched on LoL patch 26.20. Tips are written to hold at any rank; stats come from Low Elo ranked games up to patch 26.20.
Playing the duo
Volibear's Stormbringer (R) disables nearby enemy towers, while Zed's Death Mark (R) lets him dive a target and then swap back to the shadow at his original cast location.
How to play as Volibear
Wait for a wave and a clear target before using Stormbringer (R) on the turret; call Zed in as you land so he can commit Death Mark (R) while the tower is disabled.
How to play as Zed
Coordinate your dive around Volibear's Stormbringer (R) landing, use Death Mark (R) to reach the target during the disabled-turret window, and keep the recast ready to return to your shadow.
Sources
These notes come from r/Jungle_Mains, r/summonerschool, and LoL Wiki, checked against the champions' abilities.