Clinkz + Tusk

Why this works

Setting up a pickoff with Snowball looks good on paper. Tusk can initiate and bring Clinkz along for the ride, letting him immediately start Burning Barrage from point-blank range. The problem is that both heroes rely almost entirely on physical damage to get the kill. This makes it straightforward for enemies to itemize against the combo. A single support with a Ghost Scepter can survive the initial burst, and enemy cores can build armor to make both heroes feel ineffective. While the setup from Tusk provides some lockdown, it doesn't solve the fundamental issue of having a one-dimensional damage profile that is easy to counter.

Early on, this pairing can find some kills by ganking isolated heroes, as the initial burst and control is often enough. As the game progresses, however, that window closes. Once opponents get key defensive items online, finding those pickoffs becomes much harder. Teamfights become a struggle because the enemy front line can absorb your combined damage, and their back line has tools to survive your initiation. It creates a situation where you need to get far ahead during the laning stage, otherwise your joint effectiveness falls off against a team that has built to counter your shared damage type.