This deck uses cards like "King of the Swamp" to search out key cards like "Polymerization" (so you can fusion summon three of your "Blue-Eyes White Dragon" cards. Plus, this card acts as a substitute to summon the almighty "Blue-Eyes Ultimate Dragon", so if you only have two "Blue-Eyes White Dragon" cards in your hand, you do not have to wait to summon the fusion monsters. The deck also uses "Dragon's Mirror" in order to save resources, by using monsters in your GY to summon. "Gravekeeper's Spy", "Magical Merchant" and "Morphing Jar" will speed up the summoning process. They'll allow you to slim the deck down and gain field control very easily. After you summon your dragons, "My Body as a Shield" protects you from your opponent, as it stops their attempts to destroy your monsters. Once you get "Blue-Eyes Shining Dragon" out, you should have control of the game. For one, the card has potentially more than 3,000 attack points, and any effect that targets him is negated. Save "My Body as a Shield" for unique situations in which you may be in a sticky situation.
If you don't have all the cards in your deck, its easy to substitute some of the cards. "Luster Dragon" and "Skilled Dark Magician" are good trades for "D.D. Assailant" and "D.D. Warrior Lady". The key to winning with this deck is to outplay your opponent by maintaining field control. Powerful monsters will help you achieve this. Have fun dueling!