A marked card is a card that can be identified without seeing the front of the card. This includes but is not limited to warping, creases, discoloration, card thickness or texture, and water-marks. If the cards are sleeved, this includes but is not limited to sleeves with identifying marks or other unique characteristics that distinguish it from other cards in the Deck. Cards that have been physically altered to add or subtract layers of foil, etc, are not legal for sanctioned tournament play.