"Magician Girl" (マジシャン・ガール Majishan Gāru) is an archetype of Spellcastermonsters, including the "Dark Magician Girl" sub-archetype. They are based on "Dark Magician Girl", the archetype's very first member. There are six "Magician Girls", each with a different Attribute as well as a Level from 1 to 6. Members have existed since the Battle City arc of the original series, but had no support until the Yu-Gi-Oh! The Dark Side of Dimensions Movie Pack.
The first letters in the names of the flavor "Magician Girl" cards in the order of their Levels spell the word "Black", a reference to the Japanese name of "Dark Magician Girl": "Black Magician Girl".
300 ATK and DEF to all "Magician Girl" monsters you currently control for each "Magician Girl" monster with a different name on the field or in the Graveyards until the end of the turn it is discarded by its effect
The "Magician Girl" monsters' main feature is Special Summoning Spellcaster monsters from the player's hand or Graveyard when they are selected as attack targets, redirecting the attack to the Special Summoned monster while halving the attacking monster's ATK. This ability, together with cards like "Magical Dimension" and "Dark Renewal", allows them to easily Summon high-Level Spellcaster monsters.
With the multiple cards that cross-support "Dark Magician" and "Dark Magician Girl", and the multiple Special Summoning effects "Magician Girl" monsters have, "Dark Magician" becomes a tech option for the Deck.
Since the effects of the "Magician Girls" only trigger when they are selected as attack targets, the theme may become somewhat slow. Because of that, cards that force attacks like "Battle Mania", "All-Out Attacks", "Savage Colosseum" and "Yang Zing Unleashed" also become an interesting tech option to the Deck.