Lucky,
For ME, to add mass and size, I use a three day routine that relies primarly on power-type lifts such as squats, hacks, leg presses, chins, overhead presses, rack pulls, shugs, various types of deadlifts, rowing, etc.
Now, does this mean I think this will work the same for everyone? Not necessarily, it may work better for some than it does for me, it may not work as well. The deciding factor in all this is GENETICS. When I first started training MANY years ago, I gained 25 lbs of muscle in a year (I was always lean) on 20 sets per bodypart, 6 day a week workouts (a la Arnold style), and a diet of hamburgers, scotch whiskey, and late nights. In other words, I knew NOTHING about training and diet, did EVERYTHING wrong, and STILL gained 25 lbs the first year, and 10+ the second, all before ever touching AAS.
Just saying this to point out the importance of genetics above all else. The irony is: If you have good/great genetics, it doesn't really matter how you train, and if you have mediocre/poor genetics it also doesn't really matter how you train because you're going to be limited by what you came in with.
Yeah, yeah, lots of people will argue with this and say "will," and "determination," "drive," and all that will allow someone to succeed. Muscle magazine nonsense. Yuo'll suceed to the level of your genetically-determined ability.
So don't put too much faith in the way I say I train - figure out what combination of variables works best for you!