Teammates ties into my earlier remarks about not wanting to overcommit resources early, because if we have a few of our pieces safe in our hand (e.g., Stoutland/Memory Energy/Devolution Spray), then we can give our opponent a knockout on purpose and use Teammates to grab Rare Candy and Raichu to complete our setup
(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
However, as the Secret Lair versions reach the hands of players, the price of the original printing is undergoing a massive correction
A Steel type card, Snow White has 3 Strength and 5 Willpower, with 3 points of Lore gained while Questing too