Section 4, Mana accelerants: Fix Mox Diamond.
Section 8, Sideboard for Aggro: Fix Rule of Law.

Overall, very well done! Great explanations as to why and why not for selected cards. All I can think of to add is:
Land selection: Maze of Ith, Nantuko Monastary, Volrath's Stronghold, Horizon Canopy, # of fetches, duals vs basics, etc.
Equipment if using Stoneforge Mystic package.
Toolbox selection if using Elightened Tutor package.

Otherwise, the introduction started to lose me around the end, haha. Plan A, Plan B, X, Y, think my eyes just crossed. . . .

Props! Great start for reintroduction I say! And I like the banner, tell that person they did a great job. (Aside from the fact that my build doesn't use goyf's)

@Putrid Leech: There just is no place for Leech. There are too many spells that can get rid of leech in response to you pumping him. Not to mention on turn 2, you have a goyf. I'd rather run Pridemage over Leech. You could run Leech in a very aggressive version, but leech just is not a Legacy worthy card imo.