I don’t like blogs where it’s like “oh, they can change their gender at will because they are a unicorn and have a spell for that” because it canonically takes a lot of magic to do a gender swap spell. So much magic that Twilight, the element of magic, had to make it seem real with smoke and mirrors… Well, smoke anyways… But it would take a really powerful pony to be able to do it. Hell, the only one I can actually see being able to pull it off is discord because his magic isn’t the same as normal magic.