This is definitely the best promo we've seen in a while. And if you don't count judge foils, maybe the best widely-available since Restoration Angel? Then again, this is a Mythic, so the right comparison may actually be Ajani Vengeant.
So how do you get one these sweet promos? You play in a World Magic Cup Qualifier. If you're in the U.S., that means you have three chances. You can find the full list of events here, and good luck if you choose to compete!