variables:
        {efekty.%player%.heart} = false

on any movement:
        if {efekty.%player%.heart} is true:
                spawn 5 of particle heart:1 offset by 0.5, 0.5, 0.5 at player
 
command /serca:
        permission: efekt.serc
        trigger:
                if {efekty.%player%.heart} is false:
                        set {efekty.%player%.heart} to true
                        send "&2* &6Wlaczyles efekty chodzenia! (serca)"
                        stop
                if {efekty.%player%.heart} is true:
                        set {efekty.%player%.heart} to false
                        send "&2* &6Wylaczyles efekty chodzenia! (serca)"
                        stop