The Umbreon (BW93) card can be found in the Bw Black Star Promos set.
Recently sold 9 times and based on those sales is worth around £23.40.
Currently, there are 3 open listings for this card on ebay.
This card sells in the range of £13.35 to £33.45, making it quite volatile.
This Promo card was illustrated by The Pokémon Company Art Team.