Earthshaker + Mars

Why this works

Picking both these heroes for your team often feels like you're trying to solve the same problem twice. Both Earthshaker and Mars want to be the primary initiator who sets up a massive teamfight with a game-winning ultimate. While Arena of Blood followed by Echo Slam sounds powerful, it's frequently overkill and leaves your draft lacking sustained damage or defensive utility. Their basic abilities can also directly conflict. A well-placed Fissure can easily block Mars from landing a crucial Spear into his own Arena wall, actively getting in the way and ruining a setup that would have worked with almost any other hero.

This redundancy creates awkwardness in mid-game fights. The ideal scenario of a perfect Arena trapping everyone for a clean Echo Slam is rare. More often, one hero has to hold their biggest spell because the other already used theirs to accomplish the same goal of controlling the enemy team. Opponents can exploit this by forcing fights when their ultimates are on different cooldowns or by purchasing items that allow them to survive the initial burst of control. To make it work, Mars and Earthshaker need perfect timing, but they usually end up competing for the same space and setup.