The Lumineon V (SWSH250) card can be found in the Swsh Black Star Promos set.
Recently sold 8 times and based on those sales is worth around £3.32.
Currently, there are 21 open listings for this card on ebay.
This card sells in the range of £2.70 to £3.94, making it very stable.
This Promo card was illustrated by PLANETA Tsuji.
The fact that it is a V card makes it one of the more valuable cards.