The Deoxys VMAX (SWSH267) card can be found in the Swsh Black Star Promos set.
Recently sold 12 times and based on those sales is worth around £5.00.
Currently, there are 29 open listings for this card on ebay.
This card sells in the range of £2.80 to £7.20, making it very stable.
This is a Promo card.
The fact that it is a VMAX card makes it one of the more valuable cards.