Yorion, Sky Nomad

Legendary Creature — Bird Serpent{3}{W/U}{W/U}4/5

Companion — Your starting deck contains at least twenty cards more than the minimum deck size. (If this card is your chosen companion, you may put it into your hand from outside the game for {3} as a sorcery.) Flying When Yorion enters, exile any number of other nonland permanents you own and control. Return those cards to the battlefield at the beginning of the next end step.

Colour identity Azorius · Flying, Companion · Commander page

In short

Yorion, Sky Nomad has 8 listed printings; the most valuable is the Halo Foil printing from MUL at US$41.45 on TCGplayer's market price. Prices below are the cheapest in-stock listing in the United States.