@Joseph Raszagal  
We so need a Starlight and Luna episode. One in which we get to see Starlight’s history between her flashback in The Cutie Re-mark and The Cutie map. Because I don’t want to be told that her whole life was just one massive temper tantrum not only because that such a poor answer to her motivations but there has to be more to it than that. Maybe she had an exceptionally tragic life for Equestrian standards? Now i’m just speculating here but what if she lost not only Sunburst but her parents as well? Because what parent would allow their child to throw a temper tantrum for that long? My guess is that she lost her parents very soon after losing her only friend. Being orphaned and all alone would have scared her emotionally and psychologically to such an extent, do you really blame her for resenting Cutie Marks in the first place?  
Now lets throw Twilight and her friends into the mix in The Cutie Map. By taking away the only place that Starlight felt that she had a sense of control in, it reopened those psychological scars and thus her need to seek revenge on Twilight. By the time of The Cutie Re-mark, Starlight wanted in principle to make Twilight experience her pain and suffering. Also by a similar notion, Twilight extending her hoof of friendship to Starlight started a process to stitch those scars together and thus helping her put her life back together again.  
It would also be nice to get a good Luna episode because her only good episode was Luna Eclipsed way back in Season 2. Sleepless in Ponyville was a good episode, but it was more focused on Scootaloo’s development and For Whom the Sweetie Belle Toils and Bloom and Gloom were just copies of Sleepless in Ponyville offering little in new themes or content. And don’t get me started on Do Princess Dream of Magic Sheep, which was in my opinion, not only the worst episodes of Season 5, but a good contender for the worst episode of the whole series.  
The writers turned Luna, a potentially a very empathetic character into for all intents and purposes, a whiny teenager with a lot of issues, just like what George Lucas did to Anakin Skywalker by getting him portrayed by Hayden Christensen. People hated it so much, it is one of the main reasons people hate the Prequel Trilogy.  
I hope that Luna’s presentation in Do Princess Dream of Magic Sheep was only the result of bad writing because if that is what Luna really is like, I have to ask myself, why does Celestia keep her in such a high position of power within the Equestrian Government?  
She was and still is, emotionally unstable (no pun intended), and incredibly powerful. What if she felt she was been neglected again? Luna tried twice to otherthrow Equestria by force and didn’t work. What if she decided to take a more subtle approach? And what would happen if something happened to Celestia? If she were to go, by the chain of succession, Luna would take Celestia’s place, would Luna stop now that she is the ruler of the princessdom or would she try to seize more power? If it is the later, it may end with an Equestrian Empire with Luna crowning herself Empress and potentially nopony left to stop her.  
Now to bring Starlight and Luna together in a episode may help resolve major issues with both characters. But at the end of the day, its all upto the writers.

@Magic Nova  
Easily my favorite scene in that episode. Luna makes everything more epic just by being there xD .

@Joseph Raszagal  
I do remember the winter wasteland of her eighth, timeline wrecking initiated apocalypse…. don’t make me bring in the angel of death again….  

@Magic Nova  
You swill, you will not mention Christmas or Hearth’s Warming in front of her Royal Starlightness! Have you forgotten that she erased such holidays?!

@Joseph Raszagal  
Bonus: Amulet come with lifetime provision of Christmas ham…..

@Magic Nova  
I, for one, welcome our new adorable overlord.

If this happened, I was hoping for Equestria’s sake that the Alicorn Amulet only elevates a unicorn’s magical power to match that of a real alicorn. However, it may give a set magical boost to whoever wears it. Starlight’s magical power is on par with Twilight, so if it was the latter, Twilight would have been overwhelmed with all of that power……  

Oh, Jesus, the things that Starlight Glimmer could do with that kind of power.

Never in a million years. Mutual dislike of Twilight Sparkle or no, these two are polar opposites. Trixie is pride personified, and Starlight enforces humility, so that no one pony is better than anypony else (except Starlight herself, of course). They’d probably end up fighting each other long before they decided to team up against Twilight.
 
Good art, though.

Hmmm.. I think their views are too polar to make for any long-term alliance… They’re probably start to stab each other’s backs whenever they’ve got a chance to do so…