Looking for GW/Squad Arena star calculators (Prepare for R2)

Attempting to see If I can star up RG from 5 to 7 star and either tarkin or magma trooper to at least 6*. Pretty sure I could pull off RG with some good rng. I'm less sure about tarkin/magma. tarking is 4* 10/65 and magma is 2* 5/25.

If I couldn't hit 7* I'd concede and do 6 if reasonable.

I feel like R2 is really going to be good.