Board Thread:General Discussion/@comment-26385535-20150511060338/@comment-25926288-20160201175805

To add, I think the "laws of magic" aren't laws that restrict magic, but laws that are just present as guidelines. We've seen the dead brought back as early as season 2 and we see that all magic comes at a cost. To save a life another must lose it or extensive psuedo-scientific experiment to bring the loved one back in agony. We've seen Cora having a spell that can make someone think they love you (which is pretty close). All that was simply in season 2. You can't change the past, but we saw that in season 1.

As Zelena said, there are no limits just noone strong enough to do them, noone smart enough to discover those spells...until now.