Nature's Prophet + Venomancer

Why this works

Pairing a global ganker with a powerful slowing hero seems like a good plan, but the execution falls apart. The core problem is that neither Nature's Prophet nor Venomancer provides the instant lockdown or burst damage needed to secure a kill. Nature's Prophet can teleport in, but he can't hold a target down by himself for long. Venomancer's damage-over-time is significant, but it's slow to stack up and won't stop an enemy from using an escape or turning the fight. Even their ultimates, Wrath of Nature and Poison Nova, are both large area-of-effect damage spells that don't fix the fundamental issue of not being able to control a single target.

This lack of synergy forces both heroes to play their own separate games. Nature's Prophet often ends up defaulting to split-pushing because his gank attempts with Venomancer are too weak. Meanwhile, Venomancer tries to control areas with Plague Wards, playing a slow, defensive game. Smart opponents will split up to handle the split-push while their main force groups up to run over Veno's position. The pressure from one hero doesn't enable the other; instead, it leaves them both isolated and vulnerable, allowing the enemy to pick them apart one by one.