I have never actually tried to make a zombie dragon! They just don't really appeal to me; I like the sprite, but the limited visibility of said sprite makes it not worth it to me. (Most of my work days start at 8 AM, which means getting up at 7; rare is the day when I am viewing my scroll between midnight and 6 AM!)

Looks like you've found a Lurker breeder, already, so best of luck!