Minecraft OP Snowballs

/summon falling_block ~ ~1 ~ {Block:repeating_command_block,TileEntityData:{Command:/execute @e[type=Snowball] ~ ~ ~ /effect @e[type=!Snowball,name=![username],r=4] instant_damage 30 10},Time:1,DropItem:0,Passengers:[{id:falling_block,Block:redstone_block,Time:1,DropItem:0,Passengers:[{id:falling_block,Block:repeating_command_block,TileEntityData:{Command:/execute @e[type=Snowball] ~ ~ ~ /fill ~1 ~1 ~1 ~-3 ~-3 ~-3 air},Time:1,DropItem:0,Passengers:[{id:falling_block,Block:redstone_block,Time:1,DropItem:0,Passengers:[{id:falling_block,Block:repeating_command_block,TileEntityData:{Command:/execute @e[type=Snowball] ~ ~ ~ /summon LightningBolt},Time:1,DropItem:0,Passengers:[{id:falling_block,Block:redstone_block,Time:1,DropItem:1,Passengers:[{id:falling_block,Block:command_block,TileEntityData:{Command:/gamerule commandBlockOutput false},Time:1,DropItem:0,Passengers:[{id:falling_block,Block:redstone_block,Time:1,DropItem:0,Passengers:[{id:falling_block,Block:command_block,TileEntityData:{Command:/tellraw @a ["",{"text":"OP Snowballs","color":"aqua"},{"text":"\n"},{"text":"By: Bengmon","color":"dark_purple"},{"text":"\n"},{"text":"Replace the [username] in the","color":"gold"},{"text":"\n"},{"text":"bottom command block with YOUR\nusername and throw some snowballs.","color":"gold"}]},Time:1,DropItem:0,Passengers:[{id:falling_block,Block:redstone_block,Time:1,DropItem:0}]}]}]}]}]}]}]}]}]}