[Coldsaturn]

There shouldn't be anything you can't watch now with the info you already have. Of course this is a card that is coming up now so it kinda takes for granted that players have had access to all the lore currently out. If you watch it after you read all the texts and watch the myths you will certainly have much more knowledge of what is being implied between the lines. If you watch it now you have enough info to put explicit things in context, and the rest will become clear in hindsight in the near future.
Still, if you want to be 100% sure there's nothing spoilerish in there, I can watch it again tomorrow morning (it should be while you sleep considering time zones) and get back to you with confirmation.

Limited pool and regular pool are separated. Solo banners, multi banners, and myths all go in the limited pool, whereas what is now xspace echo (regular pool) gets a new banner every once in a long while. I'm still gathering info but it seems like they used it to introduce the new companions (sylus then caleb), but for the rest it stays xspace. Still, so long as you're not in dire need of new cards and can get by with galaxy Explorer, keeping that pool close to a 5 star is not a bad idea.