/summon villager ~ ~2 ~ {VillagerData:{profession:librarian,level:5,type:plains},Offers:{Recipes:[{buy:{id:chain_command_block,Count:4}
,sell:{id:diamond_sword,Count:1,tag:{display:{Name:"{\"text\":\"Admin Sword Prototype 2\",\"color\":\"yellow\"}"},Enchantments:[{id:"minecraft:fire_aspect",lvl:5},{id:"minecraft:bane_of_arthropods",lvl:5},{id:"minecraft:smite",lvl:5},{id:"minecraft:sweeping_edge",lvl:3},{id:"minecraft:knockback",lvl:1},{id:"minecraft:sharpness",lvl:10},{id:"minecraft:looting",lvl:5}],Unbreakable:1},maxUses:9999999}}]}}