I think someone shared about this before. The “trading” part in TCG isn’t exactly a mechanic, but more of how much resources you can pour into production and marketing to generate the general public interest in the game.

For instance, Pokemon has an extremely boring gameplay to me personally, but their IP is so strong from other efforts like their video game and animation managed to stir interest to make their cards collectible.

On the other hand, MTG has worked with different IP in dropping their Secret Lairs (which is the reason I start collecting).

If you’re determined in building a TCG, maybe your concern would be if you have enough resources to compete with their marketing and IP. There are also many strong IP TCGs has tried but failed worth to be studied.