Thank you for the great format and well-reasoned writeup.
Our group (tuned casual decks) decided to ban The Elderspell because it’s just a bit too “tailor-made” for the format. Being able to sweep opposing walkers or being able to give your own walker enough loyalty to ult would be powerful enough effects on their own, but when they’re combined into a two mana card it’s a bit too much and an autoinclude for any deck that can play it.