Like most Magic: The Gathering cards, the value of Aang and Katara depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Avatar: The Last Airbender Eternal)
Some Basic Fighting Energy cards, like those from Holon Phantoms and Chilling Reign, feature unique designs and are considered valuable collectibles
The little boys are so happy
DRS gave Jund midrange a huge boost and catapulted it into the top tiers of the format, most notably in the hands of Yuuya Watanabe and David Ochoa at Pro Tour Return to Ravnica (though many other players, including Willy Edel, hadnt discovered how good the card was yet)
That's right, a conversation with Pikachu
In other formats, Naturalize is usually sideboard tech, but in this set, the Bear Down Adventure is highly relevant against anything from the Virtue enchantments to Roles, Food Tokens, and soft removal enchantments like Bitter Chill