There is no potential for a fake metal card to increase in price, so it would be considered a bad investment
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In particular, promotional cards like The Masked Royal, Charizard VMAX, or Lillie are sold for high prices of over 1,000,000 JPY (~US$6,746)
Many collectors and longtime players have been on the hunt for the hottest printings of their favorite new cards, with some getting up to four versions
Recent sets have started to reverse this trend, so if you grew up hoping there really was a Loch Ness Monster, I may have cards for you to consider in your Commander decks