The goal is simple, keep circulating Dark Magician, try to get Dark Magical Circle, Eternal Soul and Dark Magician the Dragon Knight out, and use your extra deck accordingly.
Once you have five different Spellcasters, which is incredibly easy to do, on your field and in your graveyard and Magicalized Fusion in your hand summon Quintet Magician to wipe your opponents field.
Then keep circulating Dark Magician and try to keep DMDK, Eternal Soul and Dark Magical Circle on the field.