Mostly finished implementation of the new deck? ALso added some tests

src/Nadeko.Econ/Deck/NewDeck.cs

@@ -0,0 +1,51 @@
+namespace Nadeko.Econ;
+
+public abstract class NewDeck<TCard, TSuit, TValue> 
+    where TCard: NewCard<TSuit, TValue>
+    where TSuit : struct, Enum
+    where TValue : struct, Enum
+{
+    public virtual int CurrentCount
+        => _cards.Count;
+    
+    public virtual int TotalCount { get; }
+
+    private readonly LinkedList<TCard> _cards = new();
+    public NewDeck()
+    {
+        var suits = Enum.GetValues<TSuit>();
+        var values = Enum.GetValues<TValue>();
+
+        TotalCount =  suits.Length * values.Length;
+        
+        foreach (var suit in suits)
+        {
+            foreach (var val in values)
+            {
+                _cards.AddLast((TCard)Activator.CreateInstance(typeof(TCard), suit, val)!);
+            }
+        }
+    }
+
+    public virtual TCard? Draw()
+    {
+        var first = _cards.First;
+        if (first is not null)
+        {
+            _cards.RemoveFirst();
+            return first.Value;
+        }
+
+        return null;
+    }
+
+    public virtual void Shuffle()
+    {
+        var cards = _cards.ToList();
+        cards.Shuffle();
+        
+        _cards.Clear();
+        foreach (var card in cards)
+            _cards.AddFirst(card);
+    }
+}