I know to gain lean muscle mass you need to be in a calorie surplus, and to drop bodyfat % need to be in a deficit.

However, if one were to take a moderately heavy AAS cycle similiar to:

Test @ 1000mg pw
Deca @ 400mg pw
Dbol @ 50mg pd

Would it be possible to gain decent amount of muscle while losing body fat, while being on that much gear if you were in a calorie deficit?

What would be the benefits adding that much gear ?