>>930190I've watched a ton of shorts, but I don't think I've watched the one you're describing here. The only thing short-form and witches I can think of is Mahou Shoujo-tai Arusu, but that's not really similar to what you're saying.
I'll post three short-form anime charts for you to look through and hopefully it's on one of them. Note that they're pretty old, so they don't have anything from the last three years or so. Speaking of years, do you remember a general time frame for when you might've watched this? Could help narrow it down better.
