Vorthax Aureum, Golden King

Flying, vigilance
When Vorthax Aureum enters, you become the monarch.
Whenever one or more Dragons you control attack, reveal cards from the top of your library equal to the number of creatures that attacked this
way. Put up to one of Dragon creature cards among them onto the battlefield and the rest on the bottom
of your library. If you're the monarch, put any number of Dragon creature cards among them onto the battlefield instead.