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The only difference is that Beta includes two cards that were left out of Alpha and fixes a few reprints

4 Time Walk Alpha Edition - $19,188 For a brief four-month period, this was the most expensive blue card that had ever been sold, and was among the priciest of the colored cards

Though arguably, its the best pick

From July 2018, the London Mulligan rule replaced the Vancouver mulligan rule for all play: To mulligan under the new rule, the player shuffles their hand back into their library and draws seven replacement cards

You can check if a card is legitimate by searching its barcode or other unique identification numbers in the database