Akiyama, Realm-Shield

When Akiyama, Realm-Shield enters the battlefield, add a +0/+1 to Dragonborn Party Members, Citizens, or Token Creatures.
-{x}{r/w}: If he has X Party Members, he has Vigilance, Haste, Double Strike, and +X/+X until your next turn. If another player attacks you, he must block if able. If he blocks in this way, create a Treasure Token.
Choose a Background. (You can have a Background as a second commander.)