Juggernaut + Puck

Why this works

Setting up an Omnislash with Dream Coil sounds like the plan, but Puck's control often isn't what Juggernaut needs to secure a kill. Enemies caught in the Coil can still use defensive items or abilities before Juggernaut can finish. The leash doesn't guarantee the isolation needed for a full-duration Omnislash, and a smart opponent can break it at a moment that wastes the ultimate. Both heroes are also independently slippery, but their escape tools don't directly help each other secure objectives; they mostly just help themselves survive.

During teamfights, this can lead to a disconnect. Puck might initiate and create chaos, but Juggernaut often wants a harder lockdown to commit his ultimate effectively. Juggernaut could be forced to use Blade Fury defensively to purge a silence, while Puck is already trying to disengage with Phase Shift or Illusory Orb. The result is that they frequently fight parallel battles instead of a coordinated one. While they don't actively work against each other, their kits lack the kind of direct setup that would make them a potent pairing.