Chocolate Magician Girl

“Once per turn: You can discard 1 Spellcaster-Type monster; draw 1 card. Once per turn, if this card is targeted for an attack: You can target 1 Spellcaster-Type monster in your Graveyard, except "Chocolate Magician Girl"; Special Summon it, then change the attack target to it, and if you do, the attacking monster's ATK becomes half its current ATK.”