As Terran
Make:
Marine
Widow Mine
ThorMines and Thors make Muta dives too expensive.
Open in the counter tool with Mutalisk tagged ->As Protoss
Make:
Phoenix
Archon
High TemplarPhoenix prevents the snowball; Archons protect bases.
Open in the counter tool with Mutalisk tagged ->As Zerg
Make:
QueenSpore Crawler
InfestorFungal or superior Muta count decides the mirror.
Open in the counter tool with Mutalisk tagged ->
Zergling
Baneling
Roach
Ravager
Hydralisk
Lurker
Corruptor
Overlord
Overseer