The Deoxys ex (97 / 107) card can be found in the Deoxys set.
Recently sold 2 times and based on those sales is worth around £41.88.
Currently, there are 5 open listings for this card on ebay.
This card sells in the range of £39.84 to £43.92, making it very stable.
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.