Money=gold nuggets

en 1.8 /summon Mobs & Pets

they wil trade only for gold nuggets

The command

Note: Minify the command to avoid issues :)

/summon Villager ~1 ~ ~ {
    Profession: 3,
    CustomName: "Bill",
    CustomNameVisible: 1,
    Career: 1,
    CareerLevel: 42,
    PersistenceRequired: 1,
    Silent: 1,
    Invulnerable: 1,
    Attributes: [
        {
            Name: "generic.knockbackResistance",
            Base: "1f"
        },
        {
            Name: "generic.maxHealth",
            Base: 99999
        }
    ],
    ActiveEffects: [
        {
            Id: "19",
            Amplifier: 0,
            Duration: 2147483647
        }
    ],
    Offers: {
        Recipes: [
            {
                buy: {
                    id: "gold_nugget",
                    Count: 5
                },
                maxUses: 9999999,
                sell: {
                    id: "diamond",
                    Count: 1
                }
            },
            {
                buy: {
                    id: "gold_nugget",
                    Count: 30
                },
                maxUses: 9999999,
                sell: {
                    id: "arrow",
                    Count: 64
                }
            }
        ]
    }
}

Created: Sun, 21 Feb 2016 08:23:23, Updated: Sat, 02 Apr 2016 12:32:25, Views: 17