OPPPP SWORD TRY IT OUT !!!

version 1.8+ for command block is : /give @p command_block
and for OPPPP Sword is : /give @p diamond_sword 1 0 {display:{Name:"one swing one kill",Lore:["one punch man","Made by: 0x45"]},AttributeModifiers:[{AttributeName:"generic.maxHealth",Name:"generic.maxHealth",Amount:100,Operation:0,UUIDMost:46855,UUIDLeast:177713},{AttributeName:"generic.attackDamage",Name:"generic.attackDamage",Amount:9999999,Operation:0,UUIDMost:12947,UUIDLeast:132759}],Unbreakable:1}