As this list shows, while some powerful iconic cards like Griselbrand did make the cut, this list was truly dominated by cards printed in the five years
2021: Elven Empire The first official year of the decade was a remarkably good year for Commander precons
There are many ways to check for counterfeiting on the market (differences in printed color, examining the print with a magnifying glass, difference in weight, passing through strong light, bending test, etc
You can find the other 3 parts here in case you missed them: Scrappy Survivors, Hail, Caesar and Mutant Menace
You do need to be getting in there for The Shadow Lord to shine, so draft a deck that can do that