Today, most counterfeit cards are designed to pass various tests like the bend test and the light test, and some look almost exactly like the real thing, even upon close inspection (unless you're going really deep and using a jeweler's loupe, which is a good way to weed out fakes but too much work for the average player)
Mana, Ramp, Lands Let's start with artifact dork ramp that counts as two types when discarded
An alternative to this would be to store your cards in your container and then use tabs to create sections for the different varieties of rare card
One Black Star Promo A card which has a black star and the word Promo across it can be almost any type of card but they tend to be pretty desirable Pokemon from a gameplay perspective or special, exclusive alternate art cards that you can only find in products such as Elite Trainer Boxes
Playtest cards were intentionally made during early game design to test ideas, rules, and card balance