A one-of-one — written "1/1" — is a card of which only a single copy exists. These are the ultimate chase cards: unique parallels, printing plates, or special autograph/relic cards intentionally produced as the only one of their kind. Because there's literally no other copy, 1/1s can command enormous prices for popular players or characters, and their value is set by whoever wants that specific card most. Owning a true 1/1 means you hold the only version in the world. They're rarely pulled and often trade privately or at auction. For most collectors, 1/1s are aspirational — but they're a big part of what makes modern chase collecting exciting.
Updated Jul 13, 2026