Here's the problem: The expansions are cool. (No,that's not the actual problem. Read on.) However, if you start mixing them all together, it quickly becomes very unwieldly, and with so many cards in the deck, chances are you may not come up with something decent for quite some time, while those around you luck out and get all the cool stuff, making the game very lopsided.
What would you say is the ideal number of expansions to use in a game? Personally I would say 2, maybe 3. Thoughts?