I'll start with the writing details. I forget if the forum has a white background normal mode, but I'd be using that mode where the background is black, and lemme tell you the letters of the effects under the cards are almost invisible here xD I did not know/remember you could write black on black lol.
Dimensional Magician Girl
DARK Level 7 [Spellcaster/Fusion/Effect] 2500/2200
"Dark Magician Girl" + 1 DARK or Spellcaster monster
Must first be Fusion Summoned. Spellcaster monsters you control are unaffected by your opponent's Spell effects. Once per turn: You can target 1 card your opponent controls; destroy it, and if you do, Special Summon 1 Spellcaster monster from your hand or GY. If this card is sent from the field to the GY: You can Special Summon 1 "Dark Magician Girl" from your Deck or GY.
^Mainly all the "one > 1", some capitalized/uncapitalized stuff (properly for Yugioh texts you don't capitalize after semi colons unless the word inherently is, but always do after colons), and the last effect was given a colon-format because otherwise it'd be a continuous effect for no real reason.
No changes made or suggested to the actual card though. Seems solid, Dark Magician Girl might not be very good by herself but is still super easy to move around so giving her extra toys like this is fun. Another "Magician Girl" for the deck to get more Kiwi boost. Another Super Poly play against DARK decks, Does work with Fusion Subs which is neat, and can float but wouldn't be the first time a floater is used without the card it floats into (Neos Krugler into Neos Wiseman or Quasar into Shooting Star). If anything it gives an extra "WOAHHH" when somebody does bring the float out xD