Most of the time when you get a cake like that you also get a sheet cake to go along with it. Because of the time it takes, the cake gets pretty stale, and fondant isn't that great tasting to begin with...
I wonder if it's got a rice crispy treats inside? Seems like the go to method for sculpting a cake...
Apparently, WotC also uses this bakery. I don't know how to link to it directly, but go to the Gallery, then Special Event Cakes and the second photo from the last is pretty cool.