The Rainbow Energy (183 / 168) card can be found in the Celestial Storm set.
Recently sold 3 times and based on those sales is worth around £29.91.
Currently, there are 4 open listings for this card on ebay.
This card sells in the range of £18.63 to £41.19, making it quite volatile.
This Rare Secret card was illustrated by Takumi Akabane.