Earthshaker + Enigma

Why this works

Farming for two huge teamfight ultimates can strain a team's economy and map control. Both Earthshaker and Enigma need a Blink Dagger to reliably initiate, meaning two heroes are spending their early gold on the same type of item. This slows down the team’s overall power curve. The ultimates themselves, Echo Slam and Black Hole, serve a similar purpose of punishing clumped enemies. Stacking them on the same group is often redundant; you're using two fight-winning spells when one would have done the job, leaving you vulnerable if the enemy team splits up or has buybacks.

The result is often a passive early game where your team is waiting for two separate timers to come online. Once Earthshaker and Enigma have their items, there's a window where a big combination can win a fight. Smart opponents anticipate this, however. They will spread out, build saves, or focus one of the initiators before they can act. Enigma finding a good Black Hole is the main objective, and the threat of an Echo Slam follow-up doesn't fundamentally change how enemies play against that. The success hinges on the enemy making a major positioning error, which isn't a reliable plan.