Skywarden Apparitions

Flying
As you draw this card you can reveal it to create an enchantment token with "{1}{u}{u}, sacrifice this enchantment: create a 3/1 blue Bird Spirit creature token with Flying" named Skywarden Apparition.

No one in the Fire Coast really knows what they are or what they mean. They just accept it as a bad omen and a expect to see the rest of the flock very soon.