If you want good cards should beat the Meadow Mage in Campaign mode. Then beat him in Free Duel.
After you beat him about 30 times or before or after you might get the Dark Magician or even the Black Meteor Dragon Atk/3500 Def/2000 and more.
You should get B to S ranks if you want to get good cards.
More tricks, tips and cheats for this game are right here - Yu-Gi-Oh! Forbidden Memories cheats
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