says...

Time controlling

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So you ask me what the most useful magical power would be? Well that’s obvious, its time controlling. The reason for that is because you will get to see friends that you miss again and if, for example, you’ve done really bad in your S.A.T.S test, you can go forward in time, get the answer and write it in and you will do really good in your S.A.T.S test and impress your family. In addition to this you can back in time to meet a family member that you may have lost.