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
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
Running it as your Azorius commander may be challenging, but it's a good option if you're interested in that color identity
Yes, many Pokmon cards have value, especially rare, vintage, limited-edition, and highly graded cards
1 Nemata, Primeval Warden