Originally posted by KonamiYGO

In the latest version of the game, we made a change in the card store beyond adding more cards. Card packs still give 7 regular cards and 1 rare card. However, after a player gets 3 copies of any unique card (from anywhere in the game), the fourth copy has a lower chance of appearing in a card pack. You'll get 3 copies of every regular card much faster, and collecting all the rares shouldn't take quite as many points to unlock.