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In this case, the most valuable energy card ever is simply a reprint of the HeartGold & SoulSilver darkness energy, but critically, this version from Call of Legends is holofoil meaning its value ratchets up considerably

Pokemon TCG: The Pokemon Company International utilizes basic rarity symbols (circle for Common, diamond for Uncommon, star for Rare) but quickly escalates into a dazzling array of Holo Rares, Reverse Holos, and various "Ultra Rare" categories that have evolved over the years (e.g., EX, GX, V, VMAX, VSTAR, and the current 'ex' cards)

You can also use the Superdreadnought Rail Cannon Gustav Max in a different deck: Timelords

Regrowth might be cheaper, but Eternal Witness feels far more impactful due to the ease with which you can flicker it