Whether youre playing Elves or Zombies, there are tons of cards that reward you for sticking to one particular creature type and working to maximize it
Cost reduction will allow you to get cards like Karametra, God of Harvests, Reki, the History of Kamigawa, and Gandalf the White out early in order to capitalize on their ramp, draw, and synergy
Keep him in hand for a surprise attack, or for Ink when youre on the defense
Celebi also has an enticingly powerful move, which gets stronger for each Grass energy you have attached to it
They leave Cloud on the ground, thinking he wont live to see tomorrow
I won't pretend Faerie Mastermind is the equal of either of those powerhouse enchantments, but it's still a great card and if you're not running it, you probably should