Choose a player at random - fixed that it wrongly choose same player (example: Scrambleverse, close #12679, close #13526);

Inniaz, the Gale Force - fixed that it wrongly choose left/right player (close #13526);

Mage.Tests/src/test/java/org/mage/test/multiplayer/PlayersListAndOrderTest.java

@@ -115,6 +115,36 @@ public class PlayersListAndOrderTest extends CardTestMultiPlayerBase {
         execute();
     }
 
+    @Test
+    public void test_Game_PlayerListMustHaveAccessByIndex() {
+        // make sure CircularList return same data by index, see #13526
+
+        PlayerList players = new PlayerList();
+        players.add(playerA.getId());
+        players.add(playerB.getId());
+        players.add(playerC.getId());
+        players.add(playerD.getId());
+        Assert.assertEquals("last added player must be current", players.get(0), playerD.getId());
+        List<UUID> staticList = new ArrayList<>(players);
+
+        // normal
+        Assert.assertEquals(players.get(0), staticList.get(0));
+        Assert.assertEquals(players.get(1), staticList.get(1));
+        Assert.assertEquals(players.get(2), staticList.get(2));
+        Assert.assertEquals(players.get(3), staticList.get(3));
+        Assert.assertEquals(players.get(2), staticList.get(2)); // make sure no depends on calls order
+
+        // make sure CircularList keeps inner structure
+        players.setCurrent(playerC.getId());
+        Assert.assertEquals(players.get(0), staticList.get(0));
+        Assert.assertEquals(players.get(1), staticList.get(1));
+        Assert.assertEquals(players.get(2), staticList.get(2));
+        Assert.assertEquals(players.get(3), staticList.get(3));
+        Assert.assertEquals(players.get(2), staticList.get(2)); // make sure no depends on calls order
+
+        Assert.assertNull("must return null on non existing item", players.get(999));
+    }
+
     @Test
     public void test_Game_GetPlayerList() {
         // game.getPlayerList() - APNAP order, for cards usage

Mage/src/main/java/mage/util/CircularList.java

@@ -82,8 +82,8 @@ public class CircularList<E> implements List<E>, Iterable<E>, Serializable {
      */
     @Override
     public E get(int index) {
-        if (list.size() > this.index) {
-            return list.get(this.index);
+        if (list.size() > index) {
+            return list.get(index);
         }
         return null;
     }