Doom + Rubick

Why this works

Stealing Doom's ultimate sounds like a great plan for Rubick, creating a second long-duration silence to lock down another enemy hero. The problem is that Doom's primary target is almost always the enemy with the most dangerous spell—exactly the spell Rubick wants to steal for himself. A successful gank by Doom often means the enemy Tidehunter or Magnus is silenced before they can use Ravage or Reverse Polarity. This leaves Rubick with nothing game-changing to take, forcing him to settle for a much weaker ability from a secondary target.

This tension between their goals defines the matchup. If Doom does his job perfectly, he prevents the enemy's biggest threat from acting, but he also denies Rubick the opportunity to turn that threat back on them. If Doom holds his ultimate to try and bait out a big spell for Rubick, the team risks the enemy getting their full combo off and winning the fight. While having two Dooms can sometimes work out, their ideal plays are often at odds with each other, meaning one hero's impact can unintentionally limit the other's.