The Mew EX (120 / 124) card can be found in the Dragons Exalted set.
Recently sold 7 times and based on those sales is worth around £46.52.
Currently, there are 5 open listings for this card on ebay.
This card sells in the range of £27.20 to £65.84, making it quite volatile.
This Rare Ultra card was illustrated by 5ban Graphics.
The fact that it is a EX card makes it one of the more valuable cards.