yugioh duelist card case HARDCASE Yu-gi-oh : Toys & Games Duelists Advance Yugioh 2010 Duelist Pack Collection

As players engage in daily card pulls, averaging at least ten cards from two packs, its common to accumulate duplicates

The question if it was ever intended to be included in packs is not completely clear, but the discovery of E4 member styluspt that the cards was actually advertised to be in the set in a Japanese Trainers Magazine as well as on early concept designs of Jungle booster packs certainly makes this appear likely (see PIKACHU 1ST ED JUNGLE BLACK STAR PROMO - WAS IT INTENTIONAL

The reason why theyre so valuable though, is because theyre all artifacts, you can play a land and one of these Mox on your first turn, giving you access to at least two mana for free on your first turn

Exclusive promo card(s) tied to the Destined Rivals theme, designed for play and display