2D Sprite Trouble

Hey all, I'm making a simple playing card game and have been trying to fix this issue for the last 2 hours without success. It's kinda hard to fully show the problem but Ill try my best.

• I spawn multiple card prefabs.

• I create a variable name RandomCard and generate a random number between 0 and the count of my CardsInDeck list - 1.

• I create a variable named DrawnCard
  and assign it CardsInDeck[RandomCard]

• I then cycle through an array of
  sprites (the card faces) and check if sprite name is == DrawnCard If so I
  assign that sprite to the card.

• Lastly, I remove
  CardsInDeck(DrawnCard).

However, the issue I'm having is that there are still double ups. All of the DrawnCard values are unique and there are no dupes. The array of sprites are all unique in name and appearance.

I hope this is clear enough to understand, if not please ask. Code Below:

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 public class boardManager1 : MonoBehaviour {
     //Deck Makeup
     private List<string> CardsInDeck = new List<string>();
     private List<string> cardSuits = new List<string>() {
             "Clubs",
             "Spades",
             "Hearts",
             "Diamonds"
         };
 
     //Card Creation
     public Sprite[] cardImages;
     public GameObject Card;
     private int[] EmptyCardPositions = { -5, -3, -1, 1, 3, 5, 7 };
 
     void CreateDeck()
     {
         for (int cardsInDeck = 0; cardsInDeck <= 13; cardsInDeck++)
         {
             for (int cardsInSuit = 0; cardsInSuit < 4; cardsInSuit++)
             {
                 CardsInDeck.Add(cardsInDeck.ToString() + cardSuits[cardsInSuit]);
             }
         }
     }
     void DrawCard(int xPos, int yPos)
     {
         Instantiate(Card, new Vector3(xPos, yPos, -1), Quaternion.identity);
         int randomCard = Random.Range(0, CardsInDeck.Count-1);
         string DrawnCard = CardsInDeck[randomCard];
         Debug.Log(DrawnCard);
         foreach (var sprite in cardImages)
         {
             if (sprite.name == DrawnCard)
             { 
                 Card.GetComponent<SpriteRenderer>().sprite = sprite;
             }
         }
         //Remove Drawn card from the deck
         CardsInDeck.Remove(DrawnCard);
     }
 
     void Start()
     {
         CreateDeck();
         //Create Player Hand
         foreach (var position in EmptyCardPositions)
         {
             DrawCard(position,-4);
         }
         //Create AI Hand
         foreach (var position in EmptyCardPositions)
         {
             DrawCard(position, 2);
         }
     }
 
 }