The Gengar & Mimikyu GX (165 / 181) card can be found in the Team Up set.
Recently sold 32 times and based on those sales is worth around £222.44.
Currently, there are 21 open listings for this card on ebay.
This card sells in the range of £135.14 to £309.74, making it highly volatile.
This Rare Ultra card was illustrated by Midori Harada.
The fact that it is a GX card makes it one of the more valuable cards.