This is the more expensive version than the cheaper Hidden Fates Premium Powers collection
Like most Pokmon cards, the value of Houndoom depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Great Encounters)
@pokemonrevolution recently presented a new and likely theory for these Grey Thick stamps, which I will quote here: Grey Stamp Theory Grey stamped 1st Edition Base set cards for the most part have commonly been considered to exist because of either A) The ink was low when they were stamped B) The stamp was not pressed down with enough force to create a nice dark color
They are most likely backups or second picks for other, stronger cards, but if you need redundancy, these cards might be worth playing
25, 2025 EX3-069 Trial of the Four Great Dragons EX4-058 Ravemon EX4-063 Henry Wong & Shu-Chong EX4-071 Ame-no-Ohabari BT13-089 Ravemon LM-013 Diarbbitmon ACE Note: This is an image of the fixed, post-errata version