Jakiro + Primal Beast

Why this works

Stacking their lockdown and area damage seems like a free win, but the abilities fight each other. Primal Beast wants to charge in, knock people around with Onslaught, and then slam a target with Pulverize. All of this movement makes it incredibly difficult for Jakiro to land a good Ice Path or get full value from Macropyre. Primal Beast often ends up pushing enemies out of the very spells Jakiro is trying to set up, effectively saving them from the follow-up damage and wasting a huge amount of cooldowns.

This conflict plays out all game. During teamfights, the timing becomes a nightmare. If Jakiro places his spells first, Primal Beast may not have a good angle to charge in or could end up moving the target out of the fire. If Primal Beast goes first, Jakiro has to guess where the Pulverize will end, which is almost impossible to do consistently. Instead of a clean setup, you get a chaotic fight where neither hero can execute their combo properly, leaving the enemy team an easy opening to turn things around.