The Sabrina's Gengar (14 / 132) card can be found in the Gym Heroes Unlimited set.
Recently sold 16 times and based on those sales is worth around £39.50.
Currently, there are 34 open listings for this card on ebay.
This card sells in the range of £17.47 to £61.53, making it highly volatile.
This Rare Holo card was illustrated by Ken Sugimori.