The Deoxys ex (98 / 107) card can be found in the Deoxys set.
Recently sold 4 times and based on those sales is worth around £38.64.
Currently, there are 7 open listings for this card on ebay.
This card sells in the range of £20.39 to £56.89, making it quite volatile.
This Rare Holo Ex card was illustrated by Mitsuhiro Arita.
The fact that it is a EX card makes it one of the more valuable cards.