I've started noticing that all the main villains are all pony-themed:

Nightmare Moon is a evil pony of darkness.

Discord has a pony head.

Queen Chrysalis and The Changelings look like insect-pony hybrids (or as I like to call them "horse flies").

King Sombra is a Unicorn pony.

Lord Tirek has pony legs.

The writers need to start thinking outside the box with their designs. If you want my opinion, I think the next villain should be something more...different.