I know this set is old news but I just got to it today. I really wanted to finish my AKA objectives list to see what kind of crap awaits me in that final 81+ pack.
The last objective was "upgrade your 87 ovr champion." You don't have to fully upgrade him (5 + 680), you can do only the first step (i.e. spend 5 training, and that's it). I wish I checked it before overpaying for extra training.
The final pack contains 2 cards, you get both. I got 81 LT and 85 Kevin Durant, I mean Slim Reaper