Pugna + Skywrath Mage

Why this works

Putting these two heroes in the same lineup often creates a greedy and fragile core. Both Pugna and Skywrath Mage are intelligence casters that want levels and mana items early, so they can end up competing for the same pockets of safe farm. While Pugna's Decrepify can theoretically amplify the damage from a Skywrath combo, the pair lacks the hard lockdown needed to guarantee the setup. Without a reliable stun coming from another ally, mobile enemies can frequently survive the burst or turn and kill them, as both heroes are notoriously easy to bring down when caught out of position.

This shared weakness becomes more pronounced in mid-game teamfights. An enemy team with good initiation can easily jump and eliminate both Pugna and Skywrath Mage before they contribute much. This forces the rest of their team to play protectively, focusing entirely on creating space and providing a solid frontline. If that frontline ever breaks, the backline collapses immediately. They need a perfect fight to execute their damage, whereas the enemy often needs to land one good spell to dismantle their entire plan, making for an inconsistent and often difficult game.