Sparkle's Seven

Twilight's Seven is the fourth episode of season nine of My Little Pony Friendship is Magic and the show's two hundredth episode overall, celebrated as a milestone episode. The title is a reference to the 1960 film Ocean's 11, its 2001 remake, and/or the all-female spin-off to the latter Ocean's 8, previously referenced by "Sparkle's Six" in Twilight Sparkle and the Crystal Heart Spell and "Luna's 5" on the cover RI.

Production
According to Jim Miller on Twitter, this episode "is a thank you to the 5 voice actresses who brought us this far".

On April 13, 2019, Miller explained, "Back in the fall of 2017, we got [Andrea Libman], [Ashleigh Ball], [Tabitha St. Germain], [Cathy Weseluck] and [Tara Strong] (via Skype) in a boardroom at DHX, and asked them to tell us the things they’d always wished their characters had been able to do, but had not yet done on their series." "There were a lot of great, fun and funny ideas! We narrowed them down to the ones we liked best and [Josh Haber] and [Nicole Dubuc] went off and wrote a great script that incorporated those ideas into a cohesive narrative." "The end result is another unique, and dare I say especially funny, episode. All the voice actresses who helped us out are receiving a “Story by” credit."

Discovery Family and Whensiton.com
"Twilight and Shining Armor pit their wits against each other to settle a long-standing sibling rivalry, but they soon discover they are not the only competitors."

Hollywood Reporter
"Twilight Sparkle and her big brother, Shining Armor, [pit] their wits against each other to settle a long-standing sibling rivalry score."