Faceless Void + Void Spirit

Why this works

Catching enemies in a Chronosphere is the main plan, but Void Spirit's contribution can be awkward. His damage comes from zipping through targets and landing spells, which is difficult to do on enemies frozen inside the sphere without getting caught himself. He usually has to wait at the edge, throwing in what damage he can from a distance with Resonant Pulse, or wait for the ultimate to end before fully committing. This means Faceless Void doesn't get the huge, immediate burst damage from his midlaner that other combinations might provide, making his Chronosphere less of a guaranteed teamfight win.

As a result, the two heroes often play like two solo artists rather than a coordinated duo. They both have the tools to create chaos and secure kills on their own, with Void Spirit finding pickoffs and Faceless Void using Time Walk to farm safely and set up his ultimate. They can certainly win games together, but it's usually because both heroes are individually strong and scale well. Their success relies more on outplaying opponents on separate fronts than on executing a single, cohesive game plan built around their combined abilities.