I have been running this squad and it does really well. My goal is usually to blow the Workers up and take out peices with 10-30 pt cost. Shimra can clean up any jedi threat (except for maybe Lord Vader, which I painfully found out >.<). Master Tactician for the Vong is really nice and Shimra is a great peice. The Workers eventually start to hit stuff, which is great since they do 20 dmg a hit. If all your worker die by reroll's from Shimra's CE, Shimra ends up attacking stuff at +29 attack.
Nom Anor is also a great peice with Shaper, since he will always do 30 dmg with Shimra's MT ability. I went against a squad with Vader, Legacy of the Force and man it was fun stealing that Extra Attack CE for Allies that he has. Double attacking Nom and Quadruple attacking Shimra are insane. The Yamosk is great and makes your squad unpredictable. Swap squads have something to really fear when going against this squad, since swapping Shimra around usually results in stuff dying.