As is customary, the most expensive cards from Gym Challenge are first-edition versions
My favorite deck for this, however, is Shu Yun, the Silent Tempest, which can easily turn into One Punch Man with Unleash Fury
Fans find nostalgic value in cards like Venusaur, Blastoise, and Charizard, reminiscent of Pokemons early days
Electrode serves as a primary card, holding the active spot for the majority of the battle with its high-damage, low-energy-cost attacks
The one two punch of making a Hornet Queen and following it with Craterhoof is enough damage output to kill someone with 20 life and the same again in toughness on flying blockers
At that point hes pretty much unplayable, even before you account for the fact that he only protects humans and artifact creatures