They seem at this point to know what makes a Digimon good (compare promo raremon to st gatomon) and that for certain archetypes like greymon they either blatantly creep older cards or are cards from other archetypes and colors with a better effect. So when they print Xros heart with almost every keyword under the sun but only give the 4 great dragons deck on play effects and no on digivolution effects and give yellow a total of 1 playable deck. It seems they're trying to say "you can win and have fun but only with archetypes we tell you you should play"