Implement BattleEffects, add Thunderstorm

Assets/Battle/PlayArea.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class PlayArea
+{
+    public delegate void PlayAreaChangedAction();
+    public event PlayAreaChangedAction OnPlayAreaChanged;
+
+    private List<BaseCard> heroPermanents;
+
+    public PlayArea() {
+        this.heroPermanents = new List<BaseCard>();
+    }
+
+    public List<BaseCard> GetHeroPermanents() {
+        return heroPermanents;
+    }
+
+    public void AddPlayedHeroPermanent(BaseCard permanent) {
+        this.heroPermanents.Add(permanent);
+        TriggerPlayAreaChanged();
+    }
+
+    public void RemoveHeroPermanent(BaseCard permanent) {
+        this.heroPermanents.Remove(permanent);
+        TriggerPlayAreaChanged();
+    }
+
+    private void TriggerPlayAreaChanged() {
+        if (OnPlayAreaChanged != null) OnPlayAreaChanged();
+    }
+}