Keep this list handy and the value screens stop looking like a foreign language
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)
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Six mana is a big investment, but the sheer value she can generate in exchange can be enough to turn the tide of a long Commander game