You can only choose one power...

You're my friend Kazz and I've already choosen airbending. To be more accurate, omnikinesis. Cool cool 😎
Because 🌬 Air is the breathe of Life and Spirit.
..and elements are what this life is made of..

The backwards time travel one is impossible for multiple reasons. It's far more likely to go fowards in time, than backwards even. And basically we have already done that to a very minor degree.

Foreword time travel a relativistic affect of Einstein's theory of relativity.

I know, I know, you are thinking in a fantasy mainer. Yet even fantasy must have some limits. Otherwise in becomes insanity. And backwards time travel is definitely that insane.

Forgetting relativity, the impossibly of such a thing could be demonstrated through the impossibility of negative rates of change. It just can't be shown. Everything changes in a positive direction.

Oh, the hack tech with the mind could be dangerous! Lol
But I chose insanely good luck on Monday’s

Time travel is a very tricky subject …

How often can you use the power to turn back time by a max of 12 hours? Because if you can use it whenever you want, you can immediately turn it back by another 12 hours, then another… so you can do it for as long as you like.

And if you can do it instantaneously, then you can travel back to any point of time that you like, just by repeating it continuously.

And do you become 12 hours younger when you do it? Because that could be very awkward, especially if you go back more years than your age.

Turn back time. Lottery numbers 👏

Hack tech
Think about it I could get free tickets for trains and food kiosk and stuff
I could jailbreak my consoles
Or more naughty things like hack a vibrator😌