Dion, Bahamut's Dominant

Legendary Creature — Human Noble Knight // Legendary Enchantment Creature — Saga Dragon

Dragonfire Dive — During your turn, Dion and other Knights you control have flying. When Dion enters, create a 2/2 white Knight creature token. {4}{W}{W}, {T}: Exile Dion, then return it to the battlefield transformed under its owner's control. Activate only as a sorcery.