A potent 3-card combo can be created using this card, "Lemon Magician Girl" and any high-powered Spellcaster ("Dark Magician", "Dark Magician Girl", "Trance the Magic Swordsman", "Cosmo Queen", for example). First, make sure your opponent has a high-powered monster on the field (it works much better if it's the ONLY monster your opponent controls, and that "Apple" is your only monster. When "Apple" is attacked by the monster, activate her effect to Summon "Lemon", which will redirect the attack to "Lemon" instead and cut the attacking monster's ATK in half. Then use the effect of "Lemon" to Summon any high-powered Spellcaster from your hand, such as "Dark Magician", while also slashing the monster's ATK in half again and redirecting the attack to your Spellcaster of choice. By this point, even a monster with 5000 ATK will be reduced to just 1250, making it easy prey for a counterattack.
If there are other "Magician Girl" monsters on your field while there is "Apple Magician Girl" on your field and "Kiwi Magician Girl" in hand. The effect of "Kiwi" can be activated, and then destroyed by battle or a card effect your "Apple" to active her effect and recover "Kiwi" from your Graveyard to activate the effect of "Kiwi" again. So more than three times the effect of "Kiwi" can be activated per turn.