Featuring Generation III Pokmon, it introduced two completely new types of Pokmon: Delta Species Pokmon and Holon's Pokmon
(Though Ozai, the Phoenix King does this even better, allowing you to keep the excess mana.) Miirym, Sentinel Wyrm is solid, but only in green-blue-red dragon decks and nowhere else, so that's a tad limiting
Here is an example of a pretty all-in Emrakul, the Promised End decklist: Creatures (12) 1 Dragonlord Silumgar 1 Den Protector 1 Nissa, Vastwood Seer 3 Hangarback Walker 4 Deathcap Cultivator 2 Emrakul, the Promised End Planeswalkers (4) Lands (23) Spells (21) Obviously Nahiri, the Harbinger is a natural fit for Emrakul, the Promised End, and Patrick Chapin wrote last week about a bunch of different versions of Emrakul, the Promised End decks, many of which included the Boros planeswalker
Makes sense: How are you supposed to arrest an Island
As far as I know, the goals for this format arent as clearly stated and elaborated as the goals for EDH
You can also get more information about the legality of a specific card when looking it up in Gatherer