If I sat down and thought about it, there might be a few more decks I'd like to get (okay, maybe more than a few), but if I couldn't have them, that'd be fine too. I already have enough Tarot decks to work with for a good while. There were times in the past when I owned only one deck (RWS and later the Spiral) and was content with it. Ultimately, you only need one deck to do readings. The rest are for fun, variety and alternative viewpoints.