Tidehunter + Viper

Why this works

Controlling the map after a won lane often comes down to converting that lead into objectives. Tidehunter can enable this by providing large-scale lockdown with Ravage, creating a safe zone for Viper to apply Nethertoxin and his corrosive attacks on stunned enemies. Gush and Viper Strike can also stack slows on a key target, making it difficult for that hero to reposition or escape even after the initial stun wears off. This combination provides a strong single-target follow-up to Tidehunter's area-of-effect initiation, making one specific enemy hero a high-priority kill.

This duo's strength is centered around the Ravage cooldown. With it, they can confidently push towers or contest Roshan. Without it, their teamfight becomes much less threatening. Opponents will try to exploit this timing, forcing fights when Ravage is down or using mobility items to disengage after the initial stun. Because both Tidehunter and Viper can be kited, teams with good save abilities or long-range damage can split them up and pick them off. The success of the pair often depends on catching the right targets in the initial Ravage, as they lack the mobility to chase down scattered opponents.