The Ur-Dragon [Commander Masters] Kraken Set: Explorers of Ixalan Type:

Set: Explorers of Ixalan Type: Artifact Rarity: Rare Cost: {4} {4}

you may choose both

{T}: Add {G} or {W}

The same is true for creature spells you control and creature cards you own that aren't on the battlefield

1 deck box (can hold 100 sleeved cards)

The Ur-Dragon [Commander Masters] Kraken Set: Explorers of Ixalan Type:Set: Commander Masters Type: Legendary Creature Dragon Avatar Rarity: 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.