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If you are looking to sell your collection, this is the only place you need to go

And you absolutely should be tutoring for Hammer of Nazahn anyway, because the card is superb for Equipment decks, saving you a crapton of mana on equip costs and indestructible is one of the best keywords in a multiplayer format full of creature removal

unreleased prototype cards, repeated misprints, different languages) would be considered some kind of master set as well

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For instance, this error card has an image of a Pikachu, but the name says Raikou