Ancient Apparition + Ursa

Why this works

Pairing Cold Feet with Ursa's aggression looks good on paper, setting up a stun for him to build Fury Swipes stacks. The issue is that neither hero provides the reliable, instant disable to actually make it happen. Ursa needs to close the distance to apply his slow, but the target can often walk out of the stun radius before he gets there. Ancient Apparition’s stun is conditional and his other spells provide magic resistance reduction, which offers almost nothing to Ursa’s overwhelming physical damage. A support with a direct, targeted stun simply enables Ursa far more effectively.

This leaves the two heroes feeling disconnected. In lane, they lack kill threat, often forcing Ursa into a more passive farming role than he'd prefer. Later in the game, Ursa relies on his own items like a Blink Dagger to start fights, while Ancient Apparition contributes from a safe distance with Ice Blast. The ultimate is useful for finishing off targets Ursa has mauled, but it doesn't solve the core problem of getting him on top of a hero in the first place. Ursa is often left to fend for himself once he dives in.