Kirin
Kirin is creature type with aspects of a horse, a dragon, and a deer or goat. They always have flying. Kirin are omens of good fortune and long life. A kirin is said to appear with the imminent arrival or passing of a wise sage or an illustrious ruler.
Kamigawa
On Kamigawa, Kirin are kami. Saviors of Kamigawa featured them in a cycle of five: each of these rare legendary Spirit creatures has flying and a spiritcraft ability related to the casting cost of a cast spell.
These Kirin all play a role in the vignette The Meeting, where they discuss their stance on the Kami War and humanity as a whole.
Tarkir
More recently, Kirin have resurfaced in Khans of Tarkir, in the form of Alabaster Kirin who appeared on the awake of the arrival of Sarkhan Vol. In contrast to their Kamigawa cousins, Tarkir Kirin don't have the spirit subtype.