Lemon Magician Girl

Once per turn: You can Sacrifice 1 "Magician Girl", except "Lemon Magician Girl"; add 1 Blue Creature from your Deck to your hand.
Once per turn, if this card is targeted for an attack: You can place onto the battlefield 1 blue Creature from your hand, but its effects (if any) are negated, then change the attack target to it, and if you do, the attacking Creatures power becomes half