Bane + Sniper

Why this works

Holding a target still for Sniper to attack from a safe distance is the main idea here. Bane’s Fiend's Grip provides an extended lockdown that lets Sniper unload damage without needing to reposition, which is especially effective for bursting down a single priority hero. Nightmare can also set up a kill by holding an enemy for Sniper's Assassinate, or it can be used defensively to peel for him. The primary challenge is coordination, as Sniper’s regular attacks will break the Nightmare sleep, so care is needed to make sure they're working together.

In game, this pairing relies on good positioning from both heroes. When it works, Bane can neutralize a diver who would otherwise threaten Sniper, forcing the enemy team to split their focus. This can create enough space for Sniper to dictate the pace of a fight. However, both heroes are susceptible to being jumped on by multiple enemies at once and lack strong escape mechanisms. If opponents can initiate on either Bane or Sniper before the lockdown is applied, the synergy doesn't get a chance to come online and they can be run over.