The Gengar & Mimikyu GX (165 / 181) card can be found in the Team Up set.
Recently sold 15 times and based on those sales is worth around £168.37.
Currently, there are 5 open listings for this card on ebay.
This card sells in the range of £89.76 to £246.98, 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.