You want to play more 2-drop mana rocks, so the Talisman cycle (Talisman of Dominance, Talisman of Indulgence, Talisman of Creativity) is a good option as they fix mana and come into play untapped
More recent releases with unique cards or exciting alternate art are typically much more valuable than others
This is a big gamble as each player's deck is shuffled twice before beginning the match
Strong fundamentals for collectors seeking Ice-type representation
It's a joyous feeling taking down a Charizard that's just stoked up, or watching your opponent attach a fifth or sixth energy, perhaps to a Pokmon they're not even using, turning their guaranteed win into a loss
It's also very tough to permanently remove: if it dies, it returns to it's owner's hand at the beginning of the next end step, ready to cause havoc again