The Blastoise (2 / 100) card can be found in the Crystal Guardians set.
Recently sold 6 times and based on those sales is worth around £22.79.
Currently, there are 4 open listings for this card on ebay.
This card sells in the range of £17.06 to £28.52, making it quite stable.
This Rare Holo card was illustrated by Masakazu Fukuda.