There are 70 flats, 40 fixed and 30 random--totally random, with no rarity levels. You get three random flats in each box, so if you buy ten boxes (one of each army plus two duplicates) you will have enough random flats to trade for a complete set of flats. A complete set of disks is even easier, since many flats have duplicate disks--you can have one of each disk without ever laying hands on flats 6, 7, 16, etc. This is assuming you want a complete set--there's no reason why you can't play great games if you and your friends each buy one box. The game is one of the most benign collectible games out there, orders of magnitude better than Magic, and much cheaper per unit than its closest cousin, War-hammer 40,000.

That said, FFG is thinking of releasing complete sets of each army, so you can get all the orc disks, e.g., without worrying about any extraneous elves. They don't plan to release purple-only packs, but that should eliminate most grumblings.

Diskwars First Impressions