The Muk (H17) card can be found in the Aquapolis set.
Recently sold 4 times and based on those sales is worth around £35.96.
Currently, there are 4 open listings for this card on ebay.
This card sells in the range of £30.02 to £41.90, making it quite stable.
This Rare Holo card was illustrated by Hajime Kusajima.