As Terran
Make:
Ghost
Liberator
RavenDetection plus range clears Lurkers without donating bio.
Open in the counter tool with Lurker tagged ->As Protoss
Make:
Observer
Disruptor
TempestDetection and long range are mandatory.
Open in the counter tool with Lurker tagged ->As Zerg
Make:
Viper
Brood Lord
OverseerAbduct breaks the line without walking over it.
Open in the counter tool with Lurker tagged ->
Zergling
Baneling
Roach
Ravager
Queen
Hydralisk
Mutalisk
Corruptor
Overlord