You get 30 cards with the game. Of course, as is the nature with cards, you’ll want more - and there are 110 cards in the first deck that can be bought in 8-card booster packs, with extras to follow. These will range from common to rare, with ultra-rare cards so secret you’ll only be able to find out what they are when you reveal them on the PS3.
It may not look the largest playing arena for a CCG, but size isn’t everything. For a start, each square has elemental properties that can enhance (or damage) monsters that are placed on them. A water element card, for example, will have its statistics raised when placed on a water square, but could be killed if placed on a fire square. Not ideal if that’s the only position available.