Slardar + Void Spirit

Why this works

Applying Corrosive Haze on a target sets them up to be melted by physical attacks, but this doesn't do much for Void Spirit. His damage output comes almost entirely from his magical spells, so he doesn't get the same benefit from Slardar's armor reduction that a physical damage carry would. While the vision from Haze and the setup from Slithereen Crush are helpful for any gank, the core damage-amplifying component of Slardar’s kit is largely mismatched with Void Spirit's magical burst. They can lock a hero down, but their damage sources don't build on each other effectively.

In practice, this means both heroes often feel like they are executing their own game plans separately. Slardar wants to blink in and enable his physical damage dealers, while Void Spirit is looking for his own magical burst combo on a support. They can certainly coordinate to kill a single hero through chain stuns and raw damage, but it's not a particularly efficient pairing. Their success together relies more on their individual strengths and general mobility rather than any special interaction, which is why having them on the same team often feels no better or worse than any other standard lineup.