Spirit Breaker + Zeus

Why this works

Keeping the entire map under pressure becomes much easier when any enemy caught alone is a guaranteed kill. Spirit Breaker provides the global initiation with Charge of Darkness, arriving with a stun that perfectly sets up for Zeus to land his own damage. The combination of a Nether Strike and a Thundergod's Wrath is a massive amount of mixed burst damage that can delete most heroes before they can react, no matter where they are on the map. The vision from Zeus's ultimate also ensures Spirit Breaker isn't charging into a trap.

This constant threat forces the enemy team to play defensively and group up far earlier than they'd like. They can't split up to farm aggressively, which cedes map control and allows the Spirit Breaker and Zeus team to secure objectives and accelerate their own economy. The enemy is forced to react, huddling together and hoping to survive the initial burst, while your team gets to dictate the pace of the entire game by simply having two heroes who can kill anyone, anywhere.