Lightning Bow

1. [impulse] /give @p bow[minecraft:custom_data={light:1},minecraft:item_name="Lightning Bow"]

2. [impulse] /scoreboard objectives add bow minecraft.used:minecraft.bow

3. [repeat] /execute as @a at @s if entity @s[nbt={SelectedItem:{id:"minecraft:bow",components:{"minecraft:custom_data":{light:1}}}}] if score @s bow matches 1.. run tag @e[type=arrow,distance=..2,sort=nearest,limit=1] add lightningArrow

4. [chain] /execute as @e[tag=lightningArrow,nbt={inGround:1b}] at @s run summon minecraft:lightning_bolt ~ ~ ~

5. [chain] /execute as @e[tag=lightningArrow,nbt={inGround:1b}] at @s run kill @s

6. [chain] /execute as @a at @s if score @s bow matches 1.. run scoreboard players reset @s bow