I like to sun fade my old basic energy cards and I was wondering if they'd still be tournament legal. The backs of the cards are perfectly untouched and unfaded, but the face of the card looks cooler. The sun changes the yellow border to a light pink! Would this count as a marked card? The card's picture is still 100% visible and readable but just the face of the card's border are affected. I'm not even joking! This is what I really do to a few of my hundreds of old energy cards! Thanks!