public void RemoveDecks(params string[] decks)
 {
     foreach (Deck deck in Decks.GetDecks(decks))
     {
         UsedDecks.Remove(deck);
     }
 }
 public void AddDecks(params string[] decks)
 {
     foreach (Deck deck in Decks.GetDecks(decks))
     {
         UsedDecks.Add(deck);
     }
 }