I have not gotten my set of counterfeit dual lands yet but let me show you a fake Meditate that I picked up last month from one of the most reputable stores in China.
https://i.ibb.co/G34QXh1/IMG-20200115-220303.jpg
One of these two Mediates is real and the other is a counterfeit. They both pass the light test and they both feel like Magic cards. Unless you know exactly what to look for, the only visual difference is a slight difference in color between the two cards. You cannot see the details that reveal the counterfeit without a loupe. Can you tell which one is the fake?
Look at the pale blue trim on the right edge of the card. On the counterfeit, a sliver of the pale blue bleeds across the black line into the main frame.
Look at the black border around the text book. On the counterfeit, this line is weak and fuzzy, while on the real card it is stark and solid.
This is really difficult to see in the picture but if you look at Susan Van Camp's name, on the counterfeit you can see a slight space between the white lettering and the shadow.
Finally look at the Tempest expansion symbol. On the real card, the white around the storm symbol is pure white, whereas in the counterfeit there is a little reddish bleed that discolors the white.
Those are the only differences that differentiate the real card and the counterfeit that can be discovered with a loupe.