Earthshaker + Timbersaw

Why this works

Pairing two durable, area-of-effect heroes looks good on paper, but Earthshaker and Timbersaw have a core conflict. The problem comes from Fissure, which destroys any trees in its path. For Timbersaw, those trees are everything, allowing him to engage and escape with Timber Chain. An Earthshaker trying to set up a kill or block an escape can easily cut off Timbersaw's mobility in the process. Instead of a clean setup, you often get a situation where Timbersaw is stranded in the open after the initial stuns end, unable to chase or retreat effectively because his anchor points have been turned to splinters.

This dynamic makes mid-game teamfights awkward. Earthshaker might land a great Echo Slam, but when Timbersaw looks to follow up, he'll find the battlefield cleared of the trees he needs. This forces him to walk into the fray, making him a much easier target to kite and control. The enemy team can often weather the initial burst from Earthshaker and then collapse on the less-mobile Timbersaw. While both heroes want to cause chaos in the middle of a fight, their toolkits actively get in each other's way, preventing either of them from operating at full strength.