Even if you could travel back in time...you would still only be able to make 1 single trade before not knowing where the market is going again. Your one trade would set into motion a chain of events which is impossible to predict 
Have fun over the next couple of days!
Have fun over the next couple of days!
if the market would become unpredictable after 1 trade, simply travel to the future to. then do it again:
1) travel back in time
2) make trade
3) travel to the future
4) repeat all the above
:p