Well, it first debuted in 2020, and combines the hugely popular Commander format with Draft
I've written an article that covers tournament legality as much as is currently possible if you'd like to learn more
While the game continues to have some shortcomings (too many deck types are held back by a lack of draw abilities), Shimmering Skies provides options for just about every dominant deck type in the game and could help support some new deck types in the future
There are no rules that dictate which direction, clockwise or counterclockwise, one must rotate a permanent to tap it, so how do you keep track of which tapped flip cards are flipped and which aren't
He started seeing some play in Legacy, Commander prices skyrocketed, and now its a chase rare
Its also obscenely rare so you likely wont get it in time to build around it