The Ur-Dragon (Commander 2017) [Commander 2017 Oversized] Equipment and you have no maximum

and you have no maximum hand size for the rest of the game

Your planeswalkers aren't put into a graveyard if they have 0 loyalty

This spell can't be countered

sacrifice an artifact

Set: Prerelease Events Type: Artifact Rare Cost: Suspend 3—{0} (Rather than cast this card from your hand

The Ur-Dragon (Commander 2017) [Commander 2017 Oversized] Equipment and you have no maximumSet: Commander 2017 Oversized 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.