What is a good recipe for a powerful Yu-Gi-Oh Deck?

[YulGilOhtFreak#912]

I'm looking to make a deck which would compete with some friends in casual duels. Some of them run slightly competitive decks and I do not have many cards from Photon Shockwave onwards or the post-Raging Battle era. My preferred strategy is lockdown/beatdown, and I currently use a Banishark deck.
We use traditional format at school.