The Pokémon Darkness Energy 121/123 from the HeartGold & SoulSilver set features the character Umbreon and falls under the attribute of darkness. Manufactured in 2010 by The Pokémon Company, this basic energy card is part of the Pokémon TCG game and is available in English on standard card stock. With a common rarity and a regular finish, this card is a valuable addition to any collector's stash of Pokémon cards.