This One is Hard 3.0 - There are 2 effective ways (non boosting) to obtain this trophy. Obviously you can just play a lot and obtain good cards that way, but these methods will help you net the trophy with minimal effort. You can obviously use a combination of both of them as well.
1. Real Money - Buy 2-3 gold starter pack sets. They cost 1 dollar each so it will run you between 2-3 dollars. This should get you to an 83-85 if you set your line up with all of the players possible from the gold packs multiple times. Also depending on any other cards you may obtain through playing around. DO NOT waste your money on the "all-american" packs. Only buy them using coins. Although they may pay off it is a 100% gamble as only 1 player is gold or elite. They also cost $1.49 each and could rake up a small bill before obtaining the trophy. I used this method and the total bill was 6.50 and I barely mustered up an 85 overall.
2. Auction House Scavange - Go to the AH and search all gold (or silver depending on position) players available. Go over to the "bid price" and tap Square to sort. This should sort to the lowest possible price available. Some people are either nice enough, stupid enough, or just don't understand the prices and sell 80+ players for very low/reasonable prices. This one may take awhile as its mostly luck based but can save you a few dollars from your actual wallet.
Of course boosting is always an option, you can throw your best cards up on the AH and have the other person buy them for dirt cheap (I.E. tell them when they are up for sale) and visa versa. But the listed above method requires limited/no boosting