/summon Villager ~1 ~ ~ {
    Profession: 0,
    CustomName: "Villager #1",
    CustomNameVisible: 1,
    Career: 1,
    CareerLevel: 42,
    CanPickUpLoot: 0,
    PersistenceRequired: 1,
    Invulnerable: 1,
    Attributes: [
        {
            Name: "generic.maxHealth",
            Base: 99999
        }
    ],
    Offers: {
        Recipes: [
            {
                buy: {
                    id: "diamond_ore",
                    Count: 60
                },
                maxUses: 9999999,
                sell: {
                    id: "dirt",
                    Count: 10,
                    Damage: 2
                },
                rewardExp: false
            }
        ]
    }
}