The Gengar EX (114 / 119) card can be found in the Phantom Forces set.
Recently sold 40 times and based on those sales is worth around £39.84.
Currently, there are 6 open listings for this card on ebay.
This card sells in the range of £22.10 to £57.58, making it quite volatile.
This Rare Ultra card was illustrated by Ryo Ueda.
The fact that it is a EX card makes it one of the more valuable cards.