The Gengar VMAX (271 / 264) card can be found in the Fusion Strike set.
Recently sold 7 times and based on those sales is worth around £134.00.
Currently, there are 6 open listings for this card on ebay.
This card sells in the range of £108.97 to £159.03, making it highly volatile.
This Rare Rainbow card was illustrated by sowsow.
The fact that it is a VMAX card makes it one of the more valuable cards.