Anti-Mage + Zeus

Why this works

Seeing a global ultimate from Zeus might seem like the perfect setup for Anti-Mage to blink in for a kill, but the reality is more complicated. The damage from Mana Void scales with the target’s missing mana, not their missing health. Zeus provides a massive amount of magic damage to lower a hero's health bar, but he does nothing to drain their mana pool. This means Anti-Mage still has to do all the work with Mana Break to power up his own ultimate. The two spells might land in the same fight, but they don't directly enable each other in the way you might expect.

The game plan for these heroes also conflicts. Zeus hits his peak in the mid-game and wants to group with his team to force fights and apply pressure. Anti-Mage, on the other hand, wants to avoid all of that, preferring to split-push and farm his own items until he's ready to carry late. This can leave Zeus's team fighting four-versus-five for crucial portions of the game. If the team can successfully stall and create space, the combination can work, but it requires navigating a very awkward timing where one hero wants to fight and the other wants to farm.