how to make a basic 2d animation

so i have 33 different textures (of the same pciture, each one slightly different from the last). I want to animate them in a way that will replace the last picture with the new one, and i want it to go through all 33 of them in 2 seconds. the images im using are 2d, but they will be attached to a quad (this isnt a 2d game). How do i do this in unity? (ive never used the animation tools before). Do they need to be imported as sprites and used in the animator or could i just as easily do this through code?

Edit: i set all of the textures to materials and im having trouble actually cycling through them all for exactly two seconds. Every time i try to run unity now, the game freezes. heres my code

 using UnityEngine;
 using System.Collections;
 
 public class CursorAnimation : MonoBehaviour {
     float elapsedTime;
     public float timer;
      Material c0, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17,
     c18, c19, c20, c21, c22, c23, c24, c25, c26, c27, c28, c29, c30, c31, c32;
     int spot;
     Material[] c_array;
     void Start()
     {
         c0 = Resources.Load ("mat_reticle", typeof(Material)) as Material;
         c1 = Resources.Load ("mat_c1", typeof(Material)) as Material;
         c2 = Resources.Load ("mat_c2", typeof(Material)) as Material;
         c3 = Resources.Load ("mat_c3", typeof(Material)) as Material;
         c4 = Resources.Load ("mat_c4", typeof(Material)) as Material;
         c5 = Resources.Load ("mat_c5", typeof(Material)) as Material;
         c6 = Resources.Load ("mat_c6", typeof(Material)) as Material;
         c7 = Resources.Load ("mat_c7", typeof(Material)) as Material;
         c8 = Resources.Load ("mat_c8", typeof(Material)) as Material;
         c9 = Resources.Load ("mat_9", typeof(Material)) as Material;
         c10 = Resources.Load ("mat_c10", typeof(Material)) as Material;
         c11 = Resources.Load ("mat_c11", typeof(Material)) as Material;
         c12 = Resources.Load ("mat_c12", typeof(Material)) as Material;
         c13 = Resources.Load ("mat_c13", typeof(Material)) as Material;
         c14 = Resources.Load ("mat_c14", typeof(Material)) as Material;
         c15 = Resources.Load ("mat_c15", typeof(Material)) as Material;
         c16 = Resources.Load ("mat_c16", typeof(Material)) as Material;
         c17 = Resources.Load ("mat_c17", typeof(Material)) as Material;
         c18 = Resources.Load ("mat_c18", typeof(Material)) as Material;
         c19 = Resources.Load ("mat_c19", typeof(Material)) as Material;
         c20 = Resources.Load ("mat_c20", typeof(Material)) as Material;
         c21 = Resources.Load ("mat_c21", typeof(Material)) as Material;
         c22 = Resources.Load ("mat_c22", typeof(Material)) as Material;
         c23 = Resources.Load ("mat_c23", typeof(Material)) as Material;
         c24 = Resources.Load ("mat_c24", typeof(Material)) as Material;
         c25 = Resources.Load ("mat_c25", typeof(Material)) as Material;
         c26 = Resources.Load ("mat_c26", typeof(Material)) as Material;
         c27 = Resources.Load ("mat_c27", typeof(Material)) as Material;
         c28 = Resources.Load ("mat_c28", typeof(Material)) as Material;
         c29 = Resources.Load ("mat_c29", typeof(Material)) as Material;
         c30 = Resources.Load ("mat_c30", typeof(Material)) as Material;
         c31 = Resources.Load ("mat_c31", typeof(Material)) as Material;
         c32 = Resources.Load ("mat_c32", typeof(Material)) as Material;
 
         c_array = new Material[]{c0, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, c19, c20, c21, c22, c23, c24, c25, c26, c27, c28, c29, c30, c31, c32};
         timer = 2f;
         elapsedTime = 0;
         spot = 0;
     }
 
         public void animateCursor()
         {
         timer = 2.0f;
         elapsedTime = 0;
         while (timer > 0) {
             if (2.0 / 33 * (spot + 1) > elapsedTime)
                 spot++;
             if (spot > c_array.Length - 1) spot = 32;
             Debug.Log("SPOT: " + spot);
             Debug.Log("Timer: " + timer);
             GetComponent<Renderer> ().material = c_array [spot];
         }
         if (spot >= c_array.Length)
             spot = 0;
         timer = 2f;
         elapsedTime = 0;
         GetComponent<Renderer> ().material = Resources.Load ("mat_reticle", typeof(Material)) as Material;
     }
 
     void Update()
     {
         timer -= Time.deltaTime;
         elapsedTime += Time.deltaTime;
     }
 
 }