How to tell ?

Look for any errors, especially stupid ones like the Stages. Check the back of one you think is fake and then compare with one you know is real. This should help you determine whether or not it's a fake card. Or you can show it to me and I can help you, if you'd like.​
 
holding it up against a light is an old trick, the real cards are usually thicker than fakes so the card remains a solid back image under light, however I'm not sure if that works with the current sets as the official cards are made of cheaper card now.

Check for set symbols, card number, typos, printing errors etc.
 
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