Yes, many Pokmon cards have value, especially rare, vintage, limited-edition, and highly graded cards
Decks that run all the mana dorks like Derevi, Empyrial Tactician and decks that run other sorts of 1-2 drops like evasive beaters in Edric, Spymaster of Trest will get maximum value out of Harvest Season
All that being said, Ghalta doesn't actually do anything the turn it enters the battlefield
While it was always well-regarded by the community, least of all because its one of the best Pokmon packs to buy for rare cards, prices for Hidden Fates (particularly its legendary bird trio ETB and stained glass promo card), absolutely jumped in 2025, with a single box going for roughly $400
With this massive artifact out, anytime a nontoken creature you control dies, you make a Fungus Dinosaur token with the same base power and toughness as that creature