Ancient Apparition + Doom

Why this works

Trying to eliminate a single key target can feel inefficient. Both Doom and Ancient Apparition bring a powerful, long-cooldown ultimate designed to make sure one enemy hero dies. The issue is that their functions overlap significantly. Doom's ultimate already prevents the target from using most spells or items to save themselves. While Ice Blast does stop all healing, a Doomed hero is often already dead to focus fire from the rest of the team, making the additional effect feel a bit redundant. You end up using two of your biggest spells to solve a problem that one of them could have likely handled.

Throughout the game, this leads to awkward choices. Stacking both ultimates on one hero is a massive investment for a single kill, and if an ally saves them, you've likely lost the fight. The alternative is for Doom and Ancient Apparition to target different enemies, but then they aren't really playing together; they're just two heroes doing their own thing. This lack of a strong combined play means the enemy team has an easier time managing cooldowns and picking their own engagements, as there isn't a single, overwhelming threat to play around.