Ancient Apparition + Rubick

Why this works

Pairing these two heroes often creates a slow start and difficulty controlling the map. Both Ancient Apparition and Rubick are fragile supports who need levels to be effective, but neither is good at creating the space to secure them. They are both backliners who want to stay out of harm's way, which can leave your team without a durable front line or a hero to initiate trades. While a Cold Feet can certainly set up an easy Telekinesis lift, this small-scale synergy is often secondary to the fact that they can't effectively protect each other from ganks or push out lanes safely.

This weak early game puts a lot of pressure on the team's cores. If you fall behind, Rubick struggles to find safe opportunities for a good Spell Steal, and Ancient Apparition has a harder time landing a fight-winning Ice Blast. The duo is entirely reliant on surviving the laning stage relatively unscathed. If they can make it to mid-game teamfights with their key abilities ready, their combined spellcasting can be quite effective. However, aggressive opponents will often punish this pairing early and try to snowball before that point is ever reached.