An omnipotent bring visits a land of tiny horses, and makes some adjustments to destiny.

In A Bored God, apprentice deity Rijalis is trapped on Earth for an eternity. Here, he goes to Equestria instead, and addresses some problems that the world's own creator had with making destiny run as she wanted. Even with omnipotence, things can get a little difficult for someone who isn't used to being a pony.

Discord has a yard sale. He decides to sell off everything he doesn't want, whether it's his or not. This includes a load of stuff that's been lost through wormholes or whatever, including a few items from other shows.

Maybe it's a crossover (maybe it's Megas XLR, but it's probably more fun to see how long it takes to guess. If you don't know the show, you won't miss that much), maybe it's just an excuse to tie a bunch of stealth puns together. Could you tell the difference?

A crossover with Kamen Rider W - but I think it should make sense even if you don't know that show. Please, give it a chance and let me know if there's enough explanation?

What if the Elements of Harmony weren't as easy to use; what if they changed for every new bearer, and Celestia couldn't advise her faithful student on how to use the ones she and her friends had obtained? What if calling out the full power of the elements required riding with the devil, and two ponies could be a single Champion of Harmony?

Now with rewritten and improved first chapter
I'm no good at art, and my stylus stopped working. Anyone can help with better art?

She woke up with the dawn, knowing something was wrong but unable to put her hoof on the problem. The princess had saved the world enough times in the past, but never when she was feeling quite so unwell.

A slightly silly story; my apologies if there's anything in canon that would contradict the possibility of this happening, as I've only been watching sporadic episodes out of order.