You aim with the wand on the two boys.
"Look at me, Mark. Here you can learn something about creativity."
You concentrate and then speak the spell.
"Make this both to the monster which was on the next card they draw."
You look at the both and now both draw a new card from their decks.
Then both looked up to each other. Then the transformation progress begin. The first grow a few inches. Then a pair of horns appear on his head and his clothes turn into a filthy black coat with a dark armor under it. Red stripes are on his face and he holds a long sword in his hand. He has transformed into a half-demon warrior.
At the same time the hair of the other boy turns to a bright blond and grows until it reachs down to his shoulder. His whole body becomes feminine and petite. Then his chest expand and c-size breasts are under his shirt which turns now in a very short version of a armor which covers only his breasts and has a great cleavage, but belly and shoulder are free. Other armor parts appear on his hands and and the lower half of his legs. His trousers turns in a mix of an armor and a white skirt which oly reaches 6 inch down.
At least a pair of white and shiny angel wings, which are as tall as the angel, appears on his back and a lance appears in his hand.
When the female angel in the golden armor see the half-demon both start fighting against each other, but noone can hit the other critical.
You and your twin enjoy the fight in the safety of the distance.
"But this is very dangerous.", mentions Mark, "Let me fix that."
He take the wand and says:"Noone of them can hurt any other person with his weapon. And everybody in the mall except us will think that this all was normal and they don't worry about anything."
With this words a little lightning get out of the wand and hit the wall of the mall. "This is now a bit more inconspicuous, isn't it my dear sister."
"It is.", you answer, but you are a bit surly, because Mark speaks about your girlness. But then your female instinct are back and you have a new idea.
"Dearest brother, will you give me the wand for a moment?"