Fishler is clear on this: If you think you have something valuable, send it to a grading service, and they will grade it and send it back to you in a holder. The major grading services are PSA, which commands the highest resale values, and CGC (Certified Collectibles Group), which can be more cost-effective for bulk submissions
Yawgmoth provides a similar card draw option and also incredibly relevant text for the mirror, having protection from Humans as well as being able to turn creatures that would otherwise die to removal into additional cards while shrinking opposing creatures
Caught up in the hype, he purchased a 1st Edition Base Set Charizard on Craigslist for $500 that when he got it in hand, became so apparent that this thing was an absolute fake, they explained
// Lifelink Protect - Whenever Cecil attacks, other attacking creatures gain indestructible until end of turn