mewtwo pokemon card 10/130 Team Rocket's ex Gold UR (130/98) - The Glory of Team Rocket (sv10) Captured in a crystal PSA 10]Team Rocket's Mewtwo UR

It's functionally the same as the other Sothera on this list, naturally, but this Singularity Foil makes it a collector's item that's sitting at a flat $2,000 market value

As noted in a comment to GamesRadar+ by the founder of collectibles marketplace Goldin, Ken Goldin, "The Lord of the Rings Magic: The Gathering card is the first true 'one of one' card issued in a major TCG product

Lands tapping for every color is a heck of a boon for anything playing three colors or more, to say nothing of how good playing two lands a turn obviously is

Use Krenko, Mob Boss and Skirk Prospector, for example, to create infinite red mana