Code (Text):

1.  
2. on left click:
3.   player is holding a blaze rod named "<gray>Necromancer Staff":
4.     {wand.effect.%player%} is 1:
5.       if {cooldown.%player%} is true:
6.               message "&6you have to wait"
7.               stop
8.               cancel event
9.           if {cooldown.%player%} isn't set:
10.               set {cooldown.%player%} to false
11.           if {cooldown.%player%} is false:
12.               set {cooldown.%player%} to true
13.         loop 4 times:
14.           spawn zombie at player
15.           set the weapon of last spawned entity to iron sword
16.           set the name of last spawned entity to "<black>Undead Captain"
17.           set last spawned entity's max health to 30
18.               wait 1 minute
19.               set {cooldown.%player%} to false
20.         stop
21.  

I am making a necromancer staff but I have issues with the cooldown

 

it worked, thank you