You have three horses:
a white horse, a dark horse and a unicorn.
The white horse jumps the highest. It waits for you and never runs without the right command. The white horse always keeps the proper attire. When you are riding the white horse all the doors open in your path.
The dark horse is fast, the fastest. It runs and gallops as it wants, pays little attention to you. The black horse saved your life once.
The unicorn flies. You cannot train the unicorn, hence you can never know what it’ll do next. Only you can see it. Both the white and the dark horse run away when the unicorn shows up.