Phantom Assassin + Weaver

Why this works

Putting these two cores on the same team creates a resource problem from the very start. Both Phantom Assassin and Weaver want to be the primary physical damage dealer, farming key items and taking kill credit. The core issue is that Weaver provides none of the lockdown PA needs to reliably land crits on a target. He's an elusive damage dealer, not a setup hero. While The Swarm does reduce armor and can boost PA's damage, it's a poor substitute for a real stun that would keep a target from kiting or using an escape, leaving the draft feeling greedy and one-dimensional.

This forces the duo into a difficult position across the map. They need to get ahead by finding pickoffs, but their lack of control makes that hard to execute. Enemies can simply group up, knowing the PA and Weaver team struggles in a straight teamfight. With both heroes dealing almost exclusively physical damage, opponents can also itemize for armor very effectively. The win condition becomes landing a perfect Swarm before Phantom Assassin can jump with Phantom Strike, but a single save or disable on her target often causes the whole engagement to fall apart.