My god... this is insane. What if you... caused paradox-type stuff? Like... send units into the past, then collect those units in a time when they also exist, in the past, then get them all killed off in a fight? I... just... the possibilities are absurd.
Like, ok, my opponent attacks me, I win, and half my units survive. I send them into the past, and change the fight, so the original copy of the sent unit dies... does the sent unit die, too?
Or if, when units sent to the past return to the present, I send them back again? Do I now have three copies of the same unit in the past? Can I do this an infinite number of times, and thus enver lose any defensive battle?