These are probably the best fakes Iโve seen. They are just shown in quick videos and perhaps would be more obvious in real life but the cosmos holo foil looks worryingly spot on.
Would the best way to tell be by looking closely for the hex print pattern?
I looked at some of the still images in their shop, and you are right, these can fool plenty of newer collectors. The feel is the biggest tell. I remember holding wotc factory printed cards that lacked a holo layer and noticed the difference. Youโd be surprised how something so subtle is significantly noticeable. But these will definitely fool someone new to the game.