The Origin Forme Dialga VSTAR (260 / 172) card can be found in the Vstar Universe Jp set.
Recently sold 10 times and based on those sales is worth around £43.50.
Currently, there are 9 open listings for this card on ebay.
This card sells in the range of £33.84 to £53.16, making it quite stable.
This Ultra Rare card was illustrated by AKIRA EGAWA.