Magnus + Tinker

Why this works

Giving Empower to your main damage-dealer is a huge part of Magnus's game plan. The ability grants bonus damage and, crucially, cleave, but only to melee allies. Tinker is a ranged hero who deals damage almost exclusively with spells, so he gains virtually nothing from it. The cleave is entirely wasted and the damage buff is insignificant. This mismatch means one of Magnus’s key spells is effectively dead when his primary core is Tinker, making the whole team feel weaker right from the start.

This core conflict extends to how they want to play the map. Magnus is looking to set up teamfights by catching heroes with Reverse Polarity, creating a perfect opportunity for a big follow-up. Tinker’s damage, however, isn't a giant burst of area damage; it's a constant stream of spells he casts from a safe distance while using Rearm. He has no interest in being near the clump of heroes Magnus just stunned. As a result, their teamfights lack a clear focus, with each hero trying to execute a different, incompatible plan.