item holding detection

[Grandfish]

im trying to make a system where when you hold a specific item, you gain a specific amount of mana, then when you go to a different hotbar slot, the extra mana goes away.

on hotbar switch:
    loop all entities:   
        loop-entity is holding blaze rod named "&6magic stick" with lore "&6wow so op":
            add 400 to {maxmana.%loop-entity%}

, but it just doesnt work. there are no errors though.
[doublepost=1617304728,1616192958][/doublepost]bump

 

[Tarna]

Why are you looping all entities? Do you want to make it that for each person holding it, it increases everyone's mana by 400?

 

[Grandfish]

Yes, when u hold the item, u gain 400 mana , and when u switch items, u lose that extra mana.
[doublepost=1617315795,1617315256][/doublepost]anyone holding it gets +400 mana.