Jmizzle would you kindly point to the deck that can farm FG's with a decent win percentage that doesn't require an eternity?
Go to Rainbow Decks. Look at PuppyChow's deck. Remove 1 Eternity. Add 2 Quantum Towers and 2 Electrum Hourglasses.
That's the exact deck I've been using for weeks now, and I have a 54% overall win rate. Against FG's that's QUITE profitable. Sure, I deck out like one out of 12 games...but I don't care.
Also, what coinich said about AI5. AI5 is pretty durn easy to beat with a decent speed deck, and even though you only win an upgraded card about 4% of your victories (25% of the time to win a spun card, 15% of those are upgraded, roughly), you can still win 25 games (statistically enough to win an upgraded card) in about an hour if you play quickly.
It's not nearly the profitability of FG farming, but it's MUCH better than AI3, and makes a good way to build to SG's mostly-unupgraded FG deck.