Gastly is card #58 of 162 in BREAKthrough (2015), a Common illustrated by Shigenori Negishi. At about $1.18 it is the #73 most valuable card in the set. In a BREAKthrough booster it turns up about once every 10 packs. It is one of 35 Gastly cards printed so far.
1999Base Set
2003Skyridge
2007Diamond & Pearl
2010HS—Triumphant
2015BREAKthrough
2016Generations
2020Sword & Shield
2023151

















See the full BREAKthrough card list
An ungraded Gastly from BREAKthrough sells for about $1.18. A PSA 10 is worth more, roughly $5.90 by our estimate, and a PSA 9 around $2.71.
It is a Common, and it shows up about once every 10 BREAKthrough packs.
Shigenori Negishi drew the art for this card.
Yes, as a digital simulator. Holobrook lets you open BREAKthrough booster packs in your browser with the set's real pull rates and keep what you pull in a digital binder. No real cards, nothing to buy.