Death Prophet + Invoker

Why this works

Facing this pair means dealing with a lot of potential spell setup. The general plan is for Invoker to use something like Tornado or Ice Wall to control a group of enemies, allowing Death Prophet to easily land her Silence. This prevents escapes and item usage right as she activates Exorcism to run them down. On a smaller scale, a simple Cold Snap can hold a target still long enough for Spirit Siphon to do its work. When it all comes together, enemies are caught without their spells, taking heavy damage from two different sources.

The problem is that this combination is very demanding. Both Invoker and Death Prophet need a good amount of farm and levels before they can execute this plan, and neither hero is great at saving the other from a gank. If the enemy team has strong initiation, they can often jump and kill one of them before the big combo even happens. The whole strategy depends on perfect timing and positioning from both players. If one hero is out of position or gets caught, the other usually can't win the fight alone, making their teamfights very high-stakes.