The Shiftry ex (97 / 100) card can be found in the Crystal Guardians set.
Recently sold 5 times and based on those sales is worth around £12.99.
Currently, there are 23 open listings for this card on ebay.
This card sells in the range of £5.71 to £20.27, making it quite stable.
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.