The Mew Star (101 / 101) card can be found in the Dragon Frontiers set.
Recently sold 4 times and based on those sales is worth around £328.68.
Currently, there are 5 open listings for this card on ebay.
This card sells in the range of £12.05 to £645.31, making it highly volatile.
This Rare Holo Star card was illustrated by Masakazu Fukuda.