execute store result score random itemcount run random value 1..6
execute if score random itemcount matches 1 run data modify entity @s Item.components."minecraft:attribute_modifiers" append value {slot:"mainhand",type:"luck",id:"5555",amount:.3,operation:add_value}
execute if score random itemcount matches 2 run data modify entity @s Item.components."minecraft:attribute_modifiers" append value {slot:"mainhand",type:"luck",id:"5555",amount:.2,operation:add_value}
execute if score random itemcount matches 3 run data modify entity @s Item.components."minecraft:attribute_modifiers" append value {slot:"mainhand",type:"luck",id:"5555",amount:.1,operation:add_value}
execute if score random itemcount matches 4 run data modify entity @s Item.components."minecraft:attribute_modifiers" append value {slot:"mainhand",type:"luck",id:"5555",amount:-.1,operation:add_value}
execute if score random itemcount matches 5 run data modify entity @s Item.components."minecraft:attribute_modifiers" append value {slot:"mainhand",type:"luck",id:"5555",amount:-.2,operation:add_value}
execute if score random itemcount matches 6 run data modify entity @s Item.components."minecraft:attribute_modifiers" append value {slot:"mainhand",type:"luck",id:"5555",amount:-.3,operation:add_value}
scoreboard players reset random