Even with 3 star Giddeon, I am able to wreck Nightsisters with Veers, Starck, Giddeon, Piett, Range. That seems to get the turn meter train rolling the best. But if you're countering SEE, the best team is probably Veers, Giddeon, Piett, Range, Death.
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Veers(L), starck, piett, gideon, range.
2 trooper squad:
Veers (L), starck, storm, magma, piett.
Gideon (L), snow, death, shore, range.
storm/shore, snow/magma changable.
2nd one seems weak but I have them 4/4 at DSGeoTB P2 mid, snow is R4, rest are G12.
Troopers are very arguably worse with him, but add him to a Vader / Rey counter, and things become really interesting.