Lucky Green Witch is a collection of 10000 unique witches. You can get a witch for free (free mint) and if you want to have it even more unique, you can purchase one of the nine unique medallions. Each one can be sold only once. Once purchased, you can transfer the medallion between your witches or sell it separately.
Each witch has unique DNA strand, which will be used to do some magic in the next phase of the project. What magic? Probably broomstick races, stay tuned.