A fake card usually feels thin and flimsy and you may be able to see through it if you hold it up to the light. Some fake cards, on the other hand, are too hard and look shiny. If it's the wrong size, that's also a telltale sign. Different materials will also wear differently, so on more "used" cards look for more damage to corners and unusual wear patterns. Also, fake cards often have no copyright date or the illustrator at the bottom of the card. Is the card in question the same size? Is it too pointy? Is it centered right? Is there more yellow on one side of the card than the other? If it bends with great ease, it's a fake. The real cards are not flimsy.
تفحص الورقة نفسها. أمسِك ورقة أخرى. اثنِ الورقة قليلًا.