Should a Brood War game ever progress to the point where you find yourself playing Protoss with possession of a Mind Controlled Terran SCV, try this:

  1. Build a dozen or so siege tanks and some arbiters.
  2. Cluster the siege tanks together and put them in siege mode.
  3. Recall the tanks into an enemy camp while they are in siege mode.

The main difficulties lie in getting ahold of an SCV in the first place and getting your arbiter(s) into the enemy camp. However, once in place, the siege tanks are virtually invulnerable to land attacks due to their long range, and air attacks may be held off with stasis for long enough to do some decent damage with the tanks.