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The password for most cards are randomly assigned, though a few cards have their password themed around the nature of the card's release, such as 00010000 for Ten Thousand Dragon

Five-Headed Dragon Continuing with the best Yu-Gi-Oh

Passively boosts himself and other creatures every turn

The rules online are not detailed enough...

Once per turn, during the End Phase: You can make all monsters your opponent controls lose 1000 ATK, also if your opponent controls no face-up monsters, inflict 1000 damage to your opponent

Just like the other Universes Beyond sets before it, these mechanics are part of what makes the wait for these new cards all the more exciting, but these keywords won't be around for long