When you attack mid-game in a team-game put lurkers at the entrance of your enemies base, when his allie(s) send help they probably won't have a detector and you can sit back and wach their units get smashed.
Put a few lurkers in your minerals for those pesky drops.
put some at your entrance (duh)
If you are against Terran or Protoss load a few lurks in some lords (overlords) and drop them in their mineral pach.
If your are being harassed by tanks with little air d use lords to drop lurkers among the tanks. |