These are typically great uncommons that really drive you towards playing a particular color, like build-arounds and good removal, as well as very powerful commons
Other/another keeps the card from breaking, and its still going to bend quite a bit
A simple crimp on the top or bottom edge is a classic error, but a full crimp across the middle of a valuable card can be worth a lot
An official grade makes it easier to compare cards across collectors and markets, and slabs protect the card from physical damage, UV light and moisture
For Magic: The Gathering , Yu-Gi-Oh
As per usual I barely bothered with a Want list at all (only listing Power 9 cards there for the most part), opting to instead make a note in my profile that I was looking for big ticket items and had points at the ready