It is the Deck pack called Return to Chaos unlocked after defeating story mode and talking to Crow on the upper side of the B.A.D. area then challenege both dark mists which includes all dark signers, defeat them and the deck will be unlocked and the rest of the blackwings will be there
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Revival of the Fableds, Justice Strikes Back, Genex's onslaught, Ruler of Chaos, Whirlwind of Dragunity and Pulse of Trishula.
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you would have to download a hack from the internet
You can obtain Junk Warrior by getting the structure deck which it's in. It's in the Yugioh 5ds Starter Deck.
It will be hard to say but the best thing to do is look on youtube for the answer. That way you can see what to activate and summon etc.