Any visible creasing of the card, markings with a marker, holes, or dents in the cardboard from, for example, a pen, almost completely destroy the card's value
The Forceful Sentry 42829885 702
This all came about as follows: This player called the judges to check something in his opponents deck
"The Story Universe of Magic: The Gathering Is Expanding"
Many collectors and players use protective card sleeves for double-sleeving, which involves placing a card in a snug inner sleeve and then into a standard sleeve for enhanced protection
Unhinged Edition, Part 2 Before Unhinged came out, I wrote an article called "Get It?" talking about many of the jokes in Unglued that people might have missed