For my personal reference of where I am in the game. If anyone else finds this useful I'm thrilled!

Introduced November 30, 2016

Agate Fairycorn Amber Fairy Horse Amethyst Fairycorn
Glacial Fairy Horse Glimmering Fairy Horse Jade Fairy Horse
Lava Unicorn Onyx Unicorn Standard Unicorn
Sunlit Unicorn    

Normal Horse Information Here