They are basically magic cards. They allow you to summon strong monsters, provided that you sacrifice the monsters that are specified on the card first.
You can win them by defeating duelists who use them in the game. Some that use them are Tristan, Weevil, Ishizu, and Richard of York. Overall, I would say that they are more trouble than they are worth.
I hope that helps!
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you gotta get 3 of them then get the ritual card from kaiba.
Sorry but you can't seeing how its a magic card.
yugioh duelist of the roses
Fight the labyrinth guy and destroy and win it or let him summon gate guardian and win.
You can duplicate any card in Yu-Gi-Oh! The Duelist of the Roses. Duplicating a card such as the Blue Eyes White Dragon would be very useful for the game.