What happens when the lord of chaos itself becomes convinced that his dear pony friends aren’t lost, but merely “misplaced”? Well certainly a trip to a world full of naked apes is in order, and it isn’t long before Discord finds one of his precious ponies trapped within that unsightly form! He’s having none of that “No, please stop, I’m not Rainbow Dash!” nonsense, and while it takes longer than ten seconds flat, it’s still only a matter of minutes before Rainbow Dash is back to her normal self! With her blazing speed, unrivaled confidence, and unwavering loyalty, she’s just the man mare Discord needs to make the search for the rest of her friends all the more awesome!
You could say it’s a mirror version of the Five Score spell - born out of grief and desperation instead of outright cruel malice. This Discord has apparently convinced himself these big hairless monkeys he sees on Earth are in fact his pony friends, just waiting for their true memories and bodies to be restored..
Neat!