- Show that the card was Exerted this turn in the card detail panel.

forge-game/src/main/java/forge/game/card/Card.java

@@ -6116,6 +6116,7 @@ public class Card extends GameEntity implements Comparable<Card> {
     public void exert() {
         exertedByPlayer.add(getController());
         exertThisTurn++;
+        view.updateExertedThisTurn(this, true);
     }
     
     public boolean isExertedBy(final Player player) {
@@ -6124,6 +6125,7 @@ public class Card extends GameEntity implements Comparable<Card> {
     
     public void removeExertedBy(final Player player) {
         exertedByPlayer.remove(player);
+        view.updateExertedThisTurn(this, getExertedThisTurn() > 0);
     }
     
     protected void resetExtertedThisTurn() {

forge-game/src/main/java/forge/game/card/CardView.java

@@ -139,6 +139,13 @@ public class CardView extends GameEntityView {
         set(TrackableProperty.Attacking, combat != null && combat.isAttacking(c));
     }
 
+    public boolean isExertedThisTurn() {
+        return get(TrackableProperty.ExertedThisTurn);
+    }
+    void updateExertedThisTurn(Card c, boolean exerted) {
+        set(TrackableProperty.ExertedThisTurn, exerted);
+    }
+
     public boolean isBlocking() {
         return get(TrackableProperty.Blocking);
     }

forge-game/src/main/java/forge/trackable/TrackableProperty.java

@@ -57,6 +57,7 @@ public enum TrackableProperty {
     CurrentState(TrackableTypes.CardStateViewType, false), //can't respect freeze, otherwise card constructor can crash
     AlternateState(TrackableTypes.CardStateViewType),
     HiddenId(TrackableTypes.IntegerType),
+    ExertedThisTurn(TrackableTypes.BooleanType),
 
     //Card State
     Name(TrackableTypes.StringType),

forge-gui/src/main/java/forge/card/CardDetailUtil.java

@@ -532,6 +532,14 @@ public class CardDetailUtil {
             area.append("Must block " + mustBlockThese);
         }
 
+        // exerted
+        if (card.isExertedThisTurn()) {
+            if (area.length() != 0) {
+                area.append("\n\n");
+            }
+            area.append("^Exerted^");
+        }
+
         //show current card colors if enabled
         String curCardColors = formatCurrentCardColors(state);
         if (!curCardColors.isEmpty()) {