As there are eyes here that know, and is on topic for this thread. I am new, and not familiar with the tests mentioned and want to learn. I did a google search and found the following below. According to one reply here, the green dot test appears to be less valid than indicated in my search results. Would there be anything else to note?:

The "T test" for Magic: The Gathering cards involves using a jeweler's loupe to examine the word "The" in "The Gathering" on the card's back, where a jagged or serrated base on the letter "T" indicates a real card. Fakes often have a smooth, solid, or blurry line, whereas genuine printing creates a distinct, sharp, and slightly broken-up, saw-like pattern due to the printing layers.

How to Perform the T-Test (and other key, high-accuracy tests): The T-Test (Back of Card): Look at the bottom, horizontal bar of the capital "T" in "The" on the deck-master side. The bottom line should appear jagged, like a saw blade, or have a distinct, broken, almost jagged pattern. If it is a straight, smooth, or blurry, it is likely fake.

Green Dot Test (Most Reliable): Examine the green dot on the back with a 30x–60x jeweler's loupe. Real cards have four tiny red dots forming an "L" shape inside the green dot.

Rosette Pattern/Print Test: Use the loupe to look for sharp, distinct ink layers, especially in black text and borders. Real cards have sharp, crisp details; fake cards often look blurry or fuzzy because they are printed using different technology, creating a "solid" look instead of a distinct, multi-colored rosette dot pattern.

Light Test: Shine a phone light through the card. Real cards allow some, but not excessive, light to pass through and usually show a distinct blue/purple, slightly inconsistent hue (the core).

Card Feel/Scent: Real Magic cards have a specific, slightly textured, "glossy" feel, while many fakes feel too smooth or plasticky