Stardust Dragon can be obtained in "The Duelist Genesisi" booster pack, or as a gift from Yusei Fudo after defeating him an undesignated number of times in a Duel or a Turbo Duel.
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you would have to download a hack from the internet
Armed Dragon LV7 appears as a Super Rare card in the "Soul of the Duelist" booster pack in "Yu-Gi-Oh! 5D's World Championship 2010: Reverse of Arcadia".
Summon it in a duel
Stardust dragon is not available in yugioh gx tag force 3 as it is a gx version. Only a 5ds version such as yugioh 5ds tag force 4 would have stardust. So, try getting yugioh 5ds tag force 4.