This guy trade is awesome

en 1.8 /summon Villager Shops

lol hi

The command

Note: Minify the command to avoid issues :)

/summon Villager ~1 ~ ~ {
    Profession: 1,
    CustomName: "DA MVP",
    CustomNameVisible: 1,
    Career: 1,
    CareerLevel: 42,
    CanPickUpLoot: 0,
    PersistenceRequired: 1,
    NoAI: 1,
    Invulnerable: 1,
    Attributes: [
        {
            Name: "generic.maxHealth",
            Base: 99999
        }
    ],
    Offers: {
        Recipes: [
            {
                buy: {
                    id: "emerald",
                    Count: 11
                },
                buyB: {
                    id: "ender_pearl",
                    Count: 3
                },
                maxUses: 10000023,
                sell: {
                    id: 373,
                    Count: 1,
                    Damage: 16385,
                    tag: {
                        CustomPotionEffects: [
                            {
                                Id: 6,
                                Amplifier: 66666666,
                                Duration: 600
                            }
                        ],
                        display: {
                            Name: "Killer potion",
                            Lore: [
                                "One splash kill",
                                "Keep out of range before throwing"
                            ]
                        }
                    },
                    MaxUses: 10000023
                },
                rewardExp: false
            }
        ]
    }
}

Created: Mon, 04 Jan 2016 13:11:26, Updated: Mon, 11 Jan 2016 14:16:58, Views: 5