Test - base, highest dosed AAS
Primo and / or EQ - 70-80% Test dose, low side effect anabolic
Sprinkle of nandrolone if you can handle it
GH - high but not so high you have blood sugar issues or excessive lethargy and water retention
Fast insulin - high days only, titrated up to match food intake (not the other way around). Don't abuse and mess up insulin sensitivity
AI and / or SERM if needed, but ideally they won't be if Test / anabolic ratio is good
Total doses dependent on size and response. 2-3g when you're a big boy trying to get even bigger, but half that or less if you're not even pushing 200 lbs. shredded (assuming average height).
Gaining takes a ton of time. 8-12 weeks or even 16 weeks...often it's not enough time to make significant progress for the year. So you need to take what's sustainable. More is technically better, but realistically in the absolute best case, almost pipe dream scenario you're not going to gain more than 20-25g of new muscle tissue per day...and that would give you 20+ pounds in a year, so even that is probably unrealistic.
Orals, tren, and sky-high GH doses are going to jack up your blood pressure and f' up your stomach, not to mention keep you tired. What are you going to accomplish if you can't eat or train properly?
I know some people still like short oral runs offseason for a boost in workout performance. I guess it's not the dumbest idea in the world, but to me it's not worth the health impact and discomfort. For bodybuilding, strength is (mainly) a byproduct of new muscle tissue. If you take a drug to increase neural drive or give yourself more leverage via water retention, it's just putting the cart before the horse. And it'll probably leave you weaker once you have to pull that drug back out. With the approach above, I tend to keep hitting little PRs throughout the offseason, and then they just keep rolling in prep because that's when we introduce the gear that does have an immediate effect on strength...and then even those gains stick around afterwards in a rebound.