Hand Held Lazer In Minecraft

/scoreboard players set @e[type=Item] kill 1 {Item:{id:minecraft:dye}}

/execute @e[score_kill_min=1] ~ ~ ~ kill @e[r=1]

/scoreboard players reset * kill

/scoreboard players set @p lazer 3 {SelectedItemSlot:0,Inventory:[{Slot:0b,tag:{display:{Name:"Dragnoz Lazer"}}}]}

/execute @p[score_lazer_min=2] ~ ~ ~ /summon Guardian ~ ~ ~ {Riding:{id:"WitherSkull",CustomName:"LazerCow",direction:[0.0,0.0,0.0],ExplosionPower:0},ActiveEffects:[{Id:14,Duration:999999,Ambient:1}]}

/scoreboard players remove @a[score_lazer_min=1] lazer 1

/execute @p[score_lazer_min=1] ~ ~ ~ tp @e[name=LazerCow] @p[score_lazer_min=1]

/tp @e[name=LazerCow] ~ ~1 ~

/execute @p[score_lazer_min=1,score_lazer=1] ~ ~ ~ tp @e[type=!Player,r=1] ~ ~-600 ~

/summon Squid ~ ~1 ~ {CustomName:"Zombie",Riding:{id:"Zombie",Equipment:[{},{},{},{},{id:leather_helmet}]},Air:1000000,ActiveEffects:[{Id:,Duration:999999,Ambient:1}],Attributes:[{Name:generic.maxHealth,Base:1}]}