Game Usage
 Zerg vs Terran
With the invention of stacking Mutalisks with Overlords, they have become a key unit in ZvT. Good Mutalisk control is considered evidence of a good Zerg user. Mutalisk harass is primarily used to pick off workers and reduce Marine count.
 Zerg vs Protoss
Mutalisks are most often used in this matchup against Zealot-heavy armies. They are used to snipe the Protoss player's High Templars. If Zerg can successfully kill early Corsairs, Mutalisks can be dangerous in mass.