OtterDex

Red-Eyes Black Dragon

Miscellaneous Promotional CardsMISC NKC1-EN002Prismatic Secret Rare

Set
Miscellaneous Promotional Cards
Address
MISC NKC1-EN002
Rarity
Prismatic Secret Rare
Finishes
Non-foil
Game
Yu-Gi-Oh!

No price for this printing yet. That is not the same as worthless: the feed simply has no listing for it. The other printings below may still be quoted.

Is this the one you are holding?

The bottom edge of your card should read MISC NKC1-EN002. There are 9 other printings of Red-Eyes Black Dragon, worth $0.50 to $35.83. See all of them.

10 printings of Red-Eyes Black Dragon

They range from $0.50 to $35.83, a 72× difference for a card with the same name. The set code and collector number printed along the bottom edge are what tell them apart — and OtterDex reads that line off the card for you.