Every Gastly card we price, most valuable first. Prices are what copies actually sold for, updated daily.
The same Pokemon is also printed as Sabrina's Gastly, priced separately because the game treats them as different cards.
What a Gastly card is worth
The most valuable Gastly on this list is Gastly from Legendary Collection at $483£365.17€437.02, and the 41 priced copies across 36 sets are worth $1.2k£930€1.1k together. Most of that sits in a handful of printings: the older the set and the scarcer the print run, the wider the gap to the rest.
Gastly is printed in Japanese as well: 38 cards across 30 sets, the most valuable of them Gastly from Vending Machine cards Series 3 (Green) at $47.07£35.59€42.59. Switch the list above to Japanese to read those, or to Both to rank the two catalogues against each other.
The highest PSA 10 on record for Gastly sold for $13,613£10,292€12,318. 1st Edition and reverse holo printings are priced separately from the standard card, because they do not trade at the same money. Rarities here include Illustration Rare.
If you are trying to identify which Gastly you have, the set name is printed on the card and the collector number sits in the bottom corner. Open the card here and the page carries every printing of it, the graded prices, and whether grading the copy is worth the fee. Sets to start with: Legendary Collection, Skyridge, EX Legend Maker.