Maybe this post can be you sponsoring the creation of a new monster that you can then put forward to the SteemMonsters devs for their consideration to build into the game I.e. submissions can be a drawing or just a name and description of the monster and what their abilities will be. Then you pick your favorite.
For such a nice (and valuable) card you have put up - participants should definitely have to do something; rather than this being a random draw only.
Just an idea. Good luck mate ☺