The Ur-Dragon [Commander 2017] Saviors of Kamigawa then put all cards exiled

then put all cards exiled with Knowledge Vault into their owner's hand

They have "When this creature dies

the prime minister

/ There is no greater guilt than discontentment

you may pay {1}

The Ur-Dragon [Commander 2017] Saviors of Kamigawa then put all cards exiledSet: Commander 2017 Type: Legendary Creature Dragon Avatar Mythic Cost: {4}{W}{U}{B}{R}{G} Eminence As long as The Ur Dragon is in the command zone or on the battlefield, other Dragon spells you cast cost {1} less to cast. Flying Whenever one or more Dragons you control attack, draw that many cards, then you may put a permanent card from your hand onto the battlefield.