The Rocket's Persian ex (116 / 115) card can be found in the Unseen Forces set.
Recently sold 2 times and based on those sales is worth around £23.50.
Currently, there are 7 open listings for this card on ebay.
This card sells in the range of £17.00 to £30.00, making it quite stable.
This Rare Secret card was illustrated by Mitsuhiro Arita.
The fact that it is a EX card makes it one of the more valuable cards.