The deck’s objective is to make use of the low level monster’s effects in order to summon Dark Magician (DM) from your deck or hand so you will have a good advantage with your spells Dark Magic Attack and Thousand Knives, as well as a high stats monster on the field.
Mirror Wall and Windstorm of Etaqua are used to protect your low stats monsters before you can play your DM.
When to use Dark Magic Attack
Be careful with trap cards like Blast Held by a Tribute. If your opponent has many set spell or traps, wait until you can destroy them with Dark Magic Attack. You may have your DM back from graveyard with Legion’s effect, but it’s not so reliable once you would have to summon it again somehow and you might lose control of the game, but don’t be too afraid as well, one set card could be just bluff or not be a dangerous card to you.
I reckon you only need one normal spell caster and that's neo. Jester can bring him from grave and blue dragon from deck. If u have half shot. Use it to protect your double custom and jester as these cards get Dm on the field following turn.