There are all sorts of ways to take advantage of a cheap 12/12, and cards that care about the twelve-mana cost of your commander, to make building and playing the deck a lot of fun
If you dont mind working a little harder to get its strategy to work (its a little trickier than the more vanilla Amber/Amethyst deck) then it will repay you in spades with a more powerful, thought out gameplay
Selfless Spirit Again, U/W Spirits will absolutely be a pillar of the format now, and Selfless Spirit will fit right in with an acceptable body and a good ability
The most common line of play will probably be to play her and draw a card for her first trigger, then transform her the following turn before she attacks
At long last we get a card for one of the original big bads, and it's excellent
Fauna Shaman Fauna Shaman is one of the more exciting of the new cards coming to Historic, mostly because unlike many of the other cards we've been talking about, which fit in a single archetype, a ton of decks could theoretically play Fauna Shaman