Arabian Nights is the very first proper expansion for Magic: The Gathering (as Alpha, Beta, and Unlimited were largely the same card lists)
Sleeper Agent Originally from Urzas Saga, Sleeper Agent is a bit weird
Remember, part of the power of Attune with Aether was the versatility it granted energy decks, and Selesnya needs that same versatility if its going to be the best
If you want to play more damage all creature spells, youll need a little protection for Judith: Mithril Coat ($9 to $60) The fancy versions of this are under a lot of pressure, because the Coat is so so good at protecting any Commander who needs to stay in play
The addition two rarity indicators are a full borderless card, which is called an Enchanted card
Theres definitely enough design space to have an interesting voting based Elf deck that has +1/+1 counters as well and that is where I would focus while looking for additions