You unlock new booster packs mainly by going through Story Mode and defeating a set number of duelist in Story Mode or World Championship Mode. You can take a look at a Pack List in the Related Links section below which will detail how to unlock each one.
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exodia
Go to Yugioh-cards.com to check for updates when new tuornament on yugioh 5'ds be out.
u got to buy packs like the duelist genesis crossroads of chaos crimson crisis synchro awaken and more check out gamefaqs on yugioh 5ds stardust accelerator
beat him 10 times
ther are many packs that contain elemental hero cards just go to the internet and type in card pack list for yugioh 5d's stardust accelerator and you will find which packs contain which cards hope this helps