Some folks believe that var during PCT can help prevent muscle loss while your natty test levels are still low and recovering. This theory sounds reasonable to me. But I am quite sure var is suppressive, at least in my body (I notice distinctly lower libido whild on it) but it's easy to recover from (like 1-2 weeks and my mojo is back).
So you have to decide, is it worth taking something that is itself suppressive while trying to get your natty test levels to recover? In theory it would work if you could do a var dose that's low enough to not be very suppressive yet high enough to prevent muscle loss. Not sure what dose that would be or if it would work for sure.
If you experiment and learn something, please post your results here.