I just noticed the cool new city enchantment design while viewing your city details, including the option to dispel your enchantments.  Unfortunately, I noticed it on Kraxis' capitol city, and decided I didn't like him having Heart of Fire.  I clicked the cancel enchantment button, thinking an error tooltip would pop up telling me why I couldn't get rid of my opponent's magic so easily.  Instead, I was asked if I was sure I wanted to get rid of it, and after saying yes, POOF! Heart of Fire was no longer on Goyarh Hedigah.  Poor guy.