execute store result score random itemcount run random value 1..8
execute if score random itemcount matches 1 run data modify entity @s Item.components."minecraft:attribute_modifiers" append value {slot:"mainhand",type:"armor",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:"armor",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:"armor",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:"armor",id:"5555",amount:0.2,operation:add_multiplied_base}
execute if score random itemcount matches 5 run data modify entity @s Item.components."minecraft:attribute_modifiers" append value {slot:"mainhand",type:"armor",id:"5555",amount:-0.2,operation:add_multiplied_base}
execute if score random itemcount matches 6 run data modify entity @s Item.components."minecraft:attribute_modifiers" append value {slot:"mainhand",type:"armor",id:"5555",amount:-1,operation:add_value}
execute if score random itemcount matches 7 run data modify entity @s Item.components."minecraft:attribute_modifiers" append value {slot:"mainhand",type:"armor",id:"5555",amount:-2,operation:add_value}
execute if score random itemcount matches 8 run data modify entity @s Item.components."minecraft:attribute_modifiers" append value {slot:"mainhand",type:"armor",id:"5555",amount:-3,operation:add_value}
scoreboard players reset random