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

src/Nadeko.Econ/Deck/Regular/RegularCard.cs

@@ -0,0 +1,17 @@
+namespace Nadeko.Econ;
+
+public sealed class RegularCard : NewCard<RegularSuit, RegularValue>
+{
+    public RegularCard(RegularSuit suit, RegularValue value) : base(suit, value)
+    {
+    }
+
+    private bool Equals(RegularCard other)
+        => other.Suit == this.Suit && other.Value == this.Value;
+
+    public override bool Equals(object? obj)
+        => ReferenceEquals(this, obj) || obj is RegularCard other && Equals(other);
+
+    public override int GetHashCode()
+        => Suit.GetHashCode() * 17 + Value.GetHashCode();
+}

src/Nadeko.Econ/Deck/Regular/RegularDeck.cs

@@ -0,0 +1,5 @@
+namespace Nadeko.Econ;
+
+public sealed class RegularDeck : NewDeck<RegularCard, RegularSuit, RegularValue>
+{
+}

src/Nadeko.Econ/Deck/Regular/RegularSuit.cs

@@ -0,0 +1,9 @@
+namespace Nadeko.Econ;
+
+public enum RegularSuit
+{
+    Hearts,
+    Diamonds,
+    Clubs,
+    Spades
+}

src/Nadeko.Econ/Deck/Regular/RegularValue.cs

@@ -0,0 +1,18 @@
+namespace Nadeko.Econ;
+
+public enum RegularValue
+{
+    A = 1,
+    Two = 2,
+    Three = 3,
+    Four = 4,
+    Five = 5,
+    Six = 6,
+    Seven = 7,
+    Eight = 8,
+    Nine = 9,
+    Ten = 10,
+    Jack = 12,
+    Queen = 13,
+    King = 14,
+}