old onyx pokemon card Brock's Onix Promo: CoroCoro Comic March 1998 insert Onix - Trading Card Game

The standards are somewhat high as theyre looking for mint condition cards, but it absolves the seller the hassle of selling small-time cards for $0.50 on eBay and having to pack them up and ship them out one at a time

Great for prototyping

The cost reduction applies only to generic mana in the total cost of spells you cast from your graveyard

Protection makes it so the equipped creature can't be targeted, blocked, or dealt damage from anything except for colors in your commander's color identity, which lets it get in for much more damage

Outside of grading or authenticating the sealed card (I dont like the way they fold the top and bottom flaps back behind the card), I was thinking toploader, but was worried about the back flap that goes down the middle of the card leaving an indentation long term