The Doors Are Always Open At The School Of Duel. Becoming A Master Duelist Means Always Learning More About The Game And Striving To Become A Better Player. There's More To Dueling Than Knowing The Rules Of The Game - There's Also Strategy To Think About. Professor Duel Teaches His Best Students About Staple Cards, Card Economy, Theme Decks Such As A Beat-down Warrior Deck And A Powerful Exodia Deck.