/summon Villager ~1 ~ ~ {Profession:5,CustomName:"Kantor",CustomNameVisible:1,Career:1,CareerLevel:42,CanPickUpLoot:0,PersistenceRequired:1,Invulnerable:1,Attributes:[{Name:"generic.knockbackResistance",Base:"1f"},{Name:"generic.movementSpeed",Base:"0f"}],Offers:{Recipes:[{buy:{id:"emerald",Count:1},maxUses:9999999,sell:{id:"diamond",Count:15},rewardExp:false},{buy:{id:"diamond",Count:15},maxUses:9999999,sell:{id:"emerald",Count:1},rewardExp:false},{buy:{id:"diamond",Count:1},maxUses:9999999,sell:{id:"gold_ingot",Count:10},rewardExp:false},{buy:{id:"gold_ingot",Count:10},maxUses:9999999,sell:{id:"diamond",Count:1},rewardExp:false},{buy:{id:"gold_ingot",Count:1},maxUses:9999999,sell:{id:"iron_ingot",Count:5},rewardExp:false},{buy:{id:"iron_ingot",Count:5},maxUses:9999999,sell:{id:"gold_ingot",Count:1},rewardExp:false},{buy:{id:"iron_ingot",Count:1},maxUses:9999999,sell:{id:"slime_ball",Count:10},rewardExp:false},{buy:{id:"slime_ball",Count:1},maxUses:9999999,sell:{id:"iron_ingot",Count:1},rewardExp:false}]}}