impossible block trader

en 1.8 /summon Villager Shops

The command

Note: Minify the command to avoid issues :)

/summon Villager ~1 ~ ~ {
    Profession: 0,
    CustomName: "Trader",
    CustomNameVisible: 1,
    Career: 1,
    CareerLevel: 42,
    CanPickUpLoot: 0,
    PersistenceRequired: 1,
    Silent: 1,
    Invulnerable: 1,
    Attributes: [
        {
            Name: "generic.knockbackResistance",
            Base: "1f"
        },
        {
            Name: "generic.movementSpeed",
            Base: "0f"
        },
        {
            Name: "generic.maxHealth",
            Base: 99999
        }
    ],
    ActiveEffects: [
        {
            Id: "22",
            Amplifier: 0,
            Duration: 2147483647
        },
        {
            Id: "1",
            Amplifier: 0,
            Duration: 2147483647
        },
        {
            Id: "2",
            Amplifier: 0,
            Duration: 2147483647
        }
    ],
    Offers: {
        Recipes: [
            {
                buy: {
                    id: "air",
                    Count: 0
                },
                maxUses: 99999999999,
                sell: {
                    id: "command_block",
                    Count: 1
                },
                rewardExp: false
            },
            {
                buy: {
                    id: "air",
                    Count: 0
                },
                maxUses: 99999999999,
                sell: {
                    id: "end_portal",
                    Count: 1
                },
                rewardExp: false
            },
            {
                buy: {
                    id: "air",
                    Count: 0
                },
                maxUses: 99999999999,
                sell: {
                    id: "enchanted_book",
                    Count: 1
                },
                rewardExp: false
            }
        ]
    }
}

Created: Sun, 10 Jan 2016 00:20:13, Updated: Tue, 19 Jan 2016 15:19:53, Views: 3