In Yu-Gi-Oh! 5D’s World Championship 2011: Over the Nexus for the Nintendo DS, there are several unlockable decks throughout the game.
Here is the list of decks you can unlock, and what you need to do to unlock them.
Curse of Darkness – Duel Gordon in chapter 2
Dinosaur’s Rage – Begin chapter 2
Dragunity Legion – Begin chapter 6
Fury From the Deep – Enter the Rental Deck Tournament in chapter 1
Invincible Fortress – Enter the Rental Deck Tournament in chapter 1
Lord of the Storm – Begin chapter 2
Lost Sanctuary – Begin chapter 6
Machina Mayhem – Begin chapter 5
Machine Re-Volt – Begin chapter 2
Rise Of The Dragon Lords – Begin chapter 3
Spellcaster’s Command – Begin chapter 5
Spellcaster’s Judgment – Enter the Rental Deck Tournament in chapter 1
Surge of Radiance – Duel Gordon in chapter 2
The Dark Emperor – Begin chapter 3
Warrior’s Strike – Begin chapter 4
Warrior’s Triumph – Enter the Rental Deck Tournament in chapter 1
Zombie World – Begin chapter 4