i need Spawn Object loop if find object tag ("Clone") in list ,when i delete find object tag ,cript is good but no find object, please help me

 var spawnPoints : Transform[];  // Array of spawn points to be used.
 var enemyPrefabs : GameObject[]; // Array of different Enemies that are used.
 var amountEnemies = 20;  // Total number of enemies to spawn.
 // Don't exceed this amount of time between spawning enemies randomly.
 
 
 
 function Start(){
 
  
 }
 function Update(){
 if (Input.GetButtonDown("Fire2")) {
 
  Spawn();
         
             enemyPrefabs= GameObject.FindGameObjectsWithTag("Clone");
         
        
  } 
   
 } 
 function Spawn(){ 
    for (i=0; i<amountEnemies; i++){ // How many enemies to instantiate total
        // How long to wait before another enemy is instantiated.
 
       var obj : GameObject = enemyPrefabs[Random.Range(0, enemyPrefabs.length)]; // Randomize the different enemies to instantiate.
       var pos: Transform = spawnPoints[Random.Range(0, spawnPoints.length)];  // Randomize the spawnPoints to instantiate enemy at next.
 
       Instantiate(obj, pos.position, pos.rotation); 
     
     
     } 
 }