Added 4 cards from AHK

* Added Cartouche of Strength
* Added Nest of Scarabs (More correct implementation than existing one)
* Added Soul-Scar Mage
* Added Battlefield Scavenger

Mage/src/main/java/mage/abilities/dynamicvalue/common/EffectKeyValue.java

@@ -0,0 +1,45 @@
+package mage.abilities.dynamicvalue.common;
+
+
+import mage.abilities.Ability;
+import mage.abilities.dynamicvalue.DynamicValue;
+import mage.abilities.effects.Effect;
+import mage.game.Game;
+
+/**
+ * @author stravant
+ */
+public class EffectKeyValue implements DynamicValue {
+    private String key;
+    private String description;
+
+    public EffectKeyValue(String key) {
+        this.key = key;
+        this.description = key;
+    }
+
+    public EffectKeyValue(String key, String description) {
+        this(key);
+        this.description = description;
+    }
+
+    @Override
+    public int calculate(Game game, Ability source, Effect effect) {
+        return (Integer)effect.getValue(key);
+    }
+
+    @Override
+    public EffectKeyValue copy(){
+        return new EffectKeyValue(this.key, this.description);
+    }
+
+    @Override
+    public String toString() {
+        return "equal to";
+    }
+
+    @Override
+    public String getMessage() {
+        return description;
+    }
+}

Mage/src/main/java/mage/abilities/effects/common/RummageEffect.java

@@ -0,0 +1,12 @@
+package mage.abilities.effects.common;
+
+import mage.abilities.costs.common.DiscardCardCost;
+
+/**
+ * @author stravant
+ */
+public class RummageEffect extends DoIfCostPaid {
+    public RummageEffect() {
+        super(new DrawCardSourceControllerEffect(1), new DiscardCardCost());
+    }
+}

Mage/src/main/java/mage/abilities/keyword/ExertAbility.java

@@ -55,7 +55,7 @@ import mage.watchers.Watcher;
  */
 public class ExertAbility extends SimpleStaticAbility {
 
-    final private String ruleText;
+    private String ruleText;
 
     public ExertAbility(BecomesExertSourceTriggeredAbility ability) {
         this(ability, false);
@@ -63,14 +63,17 @@ public class ExertAbility extends SimpleStaticAbility {
 
     public ExertAbility(BecomesExertSourceTriggeredAbility ability, boolean exertOnlyOncePerTurn) {
         super(Zone.BATTLEFIELD, new ExertReplacementEffect(exertOnlyOncePerTurn));
-        this.addSubAbility(ability);
         ruleText = (exertOnlyOncePerTurn
                 ? "If {this} hasn't been exerted this turn, you may exert it"
-                : "You may exert {this}")
-                + " as it attacks. When you do, "
-                + ability.getEffects().get(0).getText(ability.getModes().getMode())
-                + ". <i>(An exterted creature can't untap during your next untap step)</i>";
-        ability.setRuleVisible(false);
+                : "You may exert {this}") + " as it attacks. ";
+        if (ability != null) {
+            this.addSubAbility(ability);
+            ruleText += ("When you do, " +
+                    ability.getEffects().get(0).getText(ability.getModes().getMode())
+                    + ". ");
+            ability.setRuleVisible(false);
+        }
+        ruleText += "<i>(An exterted creature can't untap during your next untap step)</i>";
         if (exertOnlyOncePerTurn) {
             getWatchers().add(new ExertedThisTurnWatcher());
         }