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He was extremely knowledgeable about MtG and especially with the card sets I was looking to sell

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(You can always play Special Guests cards and cards from The List in any format where they are already legal, such as Pioneer, Modern, or Commander.) Cards from The List are direct reprints featuring existing artwork and treatments (with the addition of a small Planeswalker symbol in the lower-left corner of the card), but Special Guests cards are reimagined in the style and aesthetics of the setechoing Ravnica's guilds and citizens with new borderless artwork

Otherwise, you can get Coins, Crystals, Credits, or assets for your online Decks, such as sleeves, boxes, or coins