The Box has 20 Skill Cards total: 8 main Skills for the pre-constructed Decks, an additional Skill for each of those Decks to let you customize it to your liking, and 4 more Skill Cards you can use to build Decks on your own. If you’ve picked up the Speed Duel: Battle City Box and Speed Duel GX: Duel Academy Box, try your hand at assembling Detective Zaloog’s Dark Scorpions!
Each Speed Duel GX: Duelists of Shadows Box contains 228 total cards, all usable in Speed Duel:
20 Skill Cards
8 (of 24) Secret Rare Cards
3 of the 8 Secret Rares in every box will be the 3 Sacred Beasts: Uria, Lord of Searing Flames, Hamon, Lord of Striking Thunder, and Raviel, Lord of Phantasms.
To use a card in Speed Duel it must have the Speed Duel Symbol on the card. Cards without the Symbol are not legal, but Speed Duel cards can be used in the Yu-Gi-Oh! TCG. Skill Cards may only be used in Speed Duel.