The Gengar (11 / 110) card can be found in the Legendary Collection set.
Recently sold 8 times and based on those sales is worth around £22.16.
Currently, there are 4 open listings for this card on ebay.
This card sells in the range of £7.06 to £37.26, making it quite volatile.
This Rare Holo card was illustrated by Keiji Kinebuchi.