Just so you know, the #DND hive mind has already decided that a medium centaur can ride a centaur riding a centaur … (repeat) … riding a centaur.
The puzzle is solved. It's centaurs all the way down.
— DM Dean Wants His Tome of Foes (@DeanMSimmons) May 15, 2018
If your DM decides that "a Medium creature" actually means "a tower of Medium creatures," that's an amazingly trippy, English-defying campaign you're playing. Live the dream! 🐎🌈 https://t.co/nYfxFeol5i
— Jeremy Crawford (@JeremyECrawford) May 15, 2018
Centaurs are now AL legal so long as they ride or are ridden by another PC centaur. https://t.co/Ox4KBFo8FJ
— Mike Mearls (@mikemearls) May 15, 2018