Urza, Chief Artificer (Extended Art) [The Brothers' War Commander] H10 If each of those creatures

If each of those creatures could block all creatures that the other is blocking

If the creature stayed on

the skull still possessed a strange power over the flow of magic

Contains exactly the same cards that used to be in the First

Set: Shadows over Innistrad Prerelease Promos Type: Instant Rarity: Rare Cost: {2}{W} Exile any number of target creatures you control

Urza, Chief Artificer (Extended Art) [The Brothers' War Commander] H10 If each of those creaturesSet: The Brothers' War Commander Type: Legendary Creature Human Artificer Rarity: Mythic Cost: {3}{W}{U}{B} Affinity for artifact creatures (This spell costs {1} less to cast for each artifact creature you control.) Artifact creatures you control have menace. At the beginning of your end step, create a 0 0 colorless Construct artifact creature token with "This creature gets +1 +1 for each artifact you control."