Pugna + Slardar

Why this works

Applying both Corrosive Haze and Decrepify to the same enemy creates a conflict. Slardar wants to land physical attacks on a target with reduced armor, but Decrepify makes that impossible. Pugna, on the other hand, wants to use Decrepify to amplify his own magic damage from Nether Blast and Life Drain. This means their primary damage-amplifying abilities are pulling in opposite directions. While Slardar's Slithereen Crush provides a reliable stun to set up Pugna's spells, their core kits don't naturally build on each other when trying to burst a single high-priority target.

In game, this forces the pair to be very disciplined with their targeting. Often, the best play is for Slardar to initiate on one hero while Pugna uses Decrepify on a different one, either offensively or to save an ally. This splits their focus and can make teamfights feel less decisive. The duo can certainly win lanes with their combined lockdown and burst, but their scaling into the mid and late game relies on perfect coordination to avoid negating each other's damage. The game plan can feel a little disjointed as a result, with each hero wanting the fight to play out differently.