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For example, characters like Aang, Katara, and Sokka all have a card dedicated to them in one or two colors, gradually progressing to three or more colors

Summon: Esper Valigarmanda Mana Value: 3R Rarity: Rare Type: Enchantment Creature Saga Drake Stats: 3/3 Card Text: I Exile an instant or sorcery card from each graveyard

It almost perfectly encapsulates my thoughts on the Fallout Commander decks

You can call it canon at any time because thats what the multiverse implies, but at the same time those promotional cards were just card styles and not actual standalone cards like the Street Fighter or Walking Dead Secret Lairs