Magic was one of the less popular eggwars maps. It was very simple and and uncreative. Al the islands are just spheres with a towers on top of it. The rings on the bottom could save you from falling off and a lot of people stayed down there to camp.
It was pretty hard to get resources especially diamonds, the gigantic mid was just to overwhelming (especially with the gigantic wizard) in comparison to the generators.
There were only 4 teams as far as I remember and games almost always went the same, first rush the first team and than fight the last one in mid.
I also remember those players who would camp on top of the wizard in mid and would make it very hard to get up there, a game took ages if this happened. These were only some reasons I remember. I also believe there was a thread somewhere from fantasyz a while ago about why it was removed. If you still want to know more about why it was removed you can always try to contact Efcluke94.
My opinion is that it can only be added back with a revamp/redesign.