Razor + Viper

Why this works

Putting these two heroes together looks like a plan to overwhelm enemies with slows and damage over time, but the strategy is often redundant. Razor and Viper both want to be the front-line core running down a single, important target. The issue is that neither of them brings the hard lockdown needed to actually secure that kill against a coordinated team. A target can be slowed to a crawl by both heroes, but they can still be saved by a Force Staff or a support spell. This overlap means you have two heroes trying to do the same job, leaving your team vulnerable to enemy saves and disengages.

This lineup can feel strong in the mid-game if you're already ahead, but it struggles to close things out. Once enemy cores get Black King Bars, much of the threat from both Viper and Razor is temporarily gone. Without a reliable stun from either of them, the team has to rely entirely on its supports for catch. This creates a draft that is very one-dimensional; it needs to snowball to win and has a hard time dealing with mobile heroes or teams that can split the fight and kite your two main damage dealers.