All sorts of things can ruin cards: Sweat, oil from hair and bathroom products, food crumbs, fingernails, spilled drinks you name it
The worst Ive ever had was a single card that was listed as Near Mint and arrived looking more in the neighborhood of Lightly Played. You take that as a risk, but you get a huge variety of sellers and the prices that come with that level of competition
Jace, the Perfected Mind - $ 110.46 Version: (Oil Slick Raised Foil) The Jace that everyone slept on - Not only did it turn out to be quite good but this version has quite the price tag as well
While building a chaos deck could be a fun and rewarding experience, its maybe one best taken alongside friends
The cards are representations of the elvish, dwarvish, and human rings (which you probably recognize from the "One Ring to rule them all" poem), as well as Sauron's One Ring