Mars + Monkey King

Why this works

Fighting for the same farm and falling behind on timings is a common outcome for this pair. The core issue is a direct conflict between their signature abilities. When Mars catches enemies in Arena of Blood, its walls block the attacks from the soldiers summoned by Monkey King's Wukong's Command. This means a huge portion of Monkey King's teamfight damage is completely negated against the very targets Mars has isolated. The only way around it is for Monkey King to put his ultimate inside the arena, which is often a suicidal jump right into the enemy team without a reliable escape.

This conflict makes teamfights feel disjointed. Mars will successfully trap a high-value hero, but his team cannot follow up with one of its biggest damage spells. Monkey King is then left to either attack someone outside the arena or wait for the wall to come down, by which time the opportunity is usually lost. Since they also tend to compete for the same role and resources in the draft, they often step on each other's toes from the very beginning, leading to a game where neither hero can hit their peak timings or find a clean, coordinated fight.