[quote=@IAmTheIsland]
<Snipped quote by Letter Bee>

The best application of Time magic that I've see was a character that could, for example, pick up a broken sword and rewind it to when it was newly forged. Basically they could reverse time on individual objects. 
[/quote]

Nice. As for me, I eventually made Time Magic a 'Forbidden Area' of Magic that requires a lot of blood sacrifices or a gigantic magical structure to even attempt.