Есть массив из элементов мувиков (карт Таро), собираюсь рендомом выбирать карты, но обратиться к элементу массива и добавить в клип не получается

Код AS3:
var card_a:Array = new Array();
var card_a0:MovieClip = new c0();
var card_a1:MovieClip = new c1();
var card_a2:MovieClip = new c2();
var card_a3:MovieClip = new c3();
var card_a4:MovieClip = new c4();
var card_a5:MovieClip = new c5();
var card_a6:MovieClip = new c6();
var card_a7:MovieClip = new c7();
var card_a8:MovieClip = new c8();
var card_a9:MovieClip = new c9();
var card_a10:MovieClip = new c10();
var card_a11:MovieClip = new c11();
var card_a12:MovieClip = new c12();
var card_a13:MovieClip = new c13();
var card_a14:MovieClip = new c14();
var card_a15:MovieClip = new c15();
var card_a16:MovieClip = new c16();
var card_a17:MovieClip = new c17();
var card_a18:MovieClip = new c18();
var card_a19:MovieClip = new c19();
var card_a20:MovieClip = new c20();
var card_a21:MovieClip = new c21();
for(var i:Number = 0; i<22; i++){
card_a.push(card_a+"i");
}