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
Card games are mostly games where whoever has access to the greatest number of resources and manages them in the best way is usually the one who wins the game
You can cast another spell among cards in your graveyard that were milled this turn using the permission granted by Raul's first ability
I'd be interested to see what readers might cook up with that, but in a dedicated Bird deck, in Commander for example, where you can build around Choco, Seeker of Paradise or Kastral, the Windcrested, this looks like a must-answer threat
Note that if you have multiple Commanders with Doctor's Companion or partner then you get the biggest effect