Unfortunately, there has been no indication that any cards no longer available will return to the game nor that they can be traded but for posteritys sake, heres every promo card in the Promo A series
18 in the United States, Canada, the United Kingdom, Germany, and France, followed by a general retail launch on Sept
Basic Game Rules Players start with 20 life and 7 cards

Let's take a look at the top-valued cards of this subset: Giratina VSTAR Gold Secret Rare GG69/GG70: $107.87 Arceus VSTAR Gold Secret Rare GG70/GG70: $64.53 Mewtwo VSTAR Special Illustration Rare GG44/GG70: $54.14 Origin Forme Palkia VSTAR Gold Secret Rare GG67/GG70: $45.20 Origin Forme Dialga VSTAR Gold Secret Rare GG68/GG70: $43.82 Leafeon VSTAR Special Illustration Rare GG35/GG70: $24.65 Glaceon VSTAR Special Illustration Rare GG40/GG70: $21.65 Suicune V Special Illustration Rare GG38/GG70: $20.59 Raikou V Special Illustration Rare GG41/GG70: $19.08 Entei V Special Illustration Rare GG36/GG70: $17.72 Darkrai VSTAR Special Illustration Rare GG50/GG70: $15.69 Deoxys VMAX Special Illustration Rare GG45/GG70: $15.24 Hisuian Zoroark VSTAR Special Illustration Rare GG56/GG70: $13.80 Irida Special Illustration Rare Trainer Supporter GG63/GG70: $12.57 Deoxys VSTAR Special Illustration Rare GG46/GG70: $9.72 Crown Zenith remained relatively steady this month

Xerneas ex XY Base Set (Full Art, 146/146) Representing one of Kaloss legendary mascots, this card remains surprisingly cheap, considering its playability and stunning rainbow-backed illustration