As a backer, you get two sets for some reason not known to me. You may also notice that half the cards are printed differently from the other half as regards flipping them over. Ah, I never thought of that. Thanks!
Throwing them out is not a good idea, though. If you keep the second set, you can have the stats and special abilities of any figure on the table at the same time; otherwise, you'll have to keep flipping.