Crystal Maiden + Spirit Breaker

Why this works

Constant pressure across the map helps define this pairing. Spirit Breaker is always looking to be active, and Crystal Maiden's Arcane Aura provides the mana he needs to use Charge of Darkness more often without going back to the fountain. This lets him maintain a global threat that forces enemies to play cautiously. When he does connect with a Charge, it gives Crystal Maiden all the time she needs to walk up and land a full-duration Frostbite. The chain of disables from both heroes can lock down a single target for a very long time.

The game plan is to turn this ganking potential into objectives. After a successful pick-off, the pair can create space for their cores to farm or help secure a tower. It forces the enemy team to play much closer together and invest heavily in vision to track Spirit Breaker's movements. The main counter-play involves either saving the charged target or punishing the dive. If Spirit Breaker gets too far ahead of his team, he can be isolated and burst down, leaving a very vulnerable Crystal Maiden alone in the fight.