The Rocket's Articuno ex (96 / 109) card can be found in the Team Rocket Returns set.
Recently sold 3 times and based on those sales is worth around £106.16.
Currently, there are 4 open listings for this card on ebay.
This card sells in the range of £13.45 to £198.87, making it highly volatile.
This Rare Holo Ex card was illustrated by Ryo Ueda.
The fact that it is a EX card makes it one of the more valuable cards.