Added the possibility to hide a ability for rule text generation.

Mage/src/mage/abilities/AbilitiesImpl.java

@@ -71,6 +71,9 @@ public class AbilitiesImpl<T extends Ability> extends ArrayList<T> implements Ab
         List<String> rules = new ArrayList<String>();
 
         for (T ability:this) {
+            if (!ability.getRuleVisible()) {
+                continue;
+            }
             if (!(ability instanceof SpellAbility || ability instanceof PlayLandAbility)) {
                 if (ability.getRuleAtTheTop()) {
                     rules.add(0, ability.getRule());
@@ -304,8 +307,10 @@ public class AbilitiesImpl<T extends Ability> extends ArrayList<T> implements Ab
     public String getValue() {
         List<String> abilities = new ArrayList<String>();
         for (T ability: this) {
+            if (ability.toString() != null) {
                 abilities.add(ability.toString());
             }
+        }
         Collections.sort(abilities);
         StringBuilder sb = new StringBuilder();
         for (String s: abilities) {

Mage/src/mage/abilities/Ability.java

@@ -375,10 +375,30 @@ public interface Ability extends Controllable, Serializable {
     /**
      * Sets the value for the ruleAtTheTop attribute
      *
+     * true = show the rule at the top position of the rules
+     *
      * @param ruleAtTheTop
      */
     void setRuleAtTheTop(boolean ruleAtTheTop);
 
+    /**
+     * Returns true if this ability's rule is visible on the card tooltip
+     *
+     * @return
+     */
+    boolean getRuleVisible();
+    
+    /**
+     * Sets the value for the ruleVisible attribute
+     *
+     * true = rule will be shown for the card / permanent
+     * false = rule won't be shown
+     *
+     * @param ruleAtTheTop
+     */
+    void setRuleVisible(boolean ruleVisible);
+
+
     /**
      * Get the originalId of the ability
      * 

Mage/src/mage/abilities/AbilityImpl.java

@@ -77,6 +77,7 @@ public abstract class AbilityImpl<T extends AbilityImpl<T>> implements Ability {
     protected String name;
     protected boolean usesStack = true;
     protected boolean ruleAtTheTop = false;
+    protected boolean ruleVisible = true;
 
     @Override
     public abstract T copy();
@@ -111,6 +112,7 @@ public abstract class AbilityImpl<T extends AbilityImpl<T>> implements Ability {
         }
         this.modes = ability.modes.copy();
         this.ruleAtTheTop = ability.ruleAtTheTop;
+        this.ruleVisible = ability.ruleVisible;
     }
 
     @Override
@@ -417,7 +419,7 @@ public abstract class AbilityImpl<T extends AbilityImpl<T>> implements Ability {
 
     protected String formatRule(String rule, String source) {
         String replace = rule;
-        if (source != null && !source.isEmpty()) {
+        if (rule != null && source != null && !source.isEmpty()) {
             replace = rule.replace("{this}", source);
             replace = replace.replace("{source}", source);
         }
@@ -574,6 +576,17 @@ public abstract class AbilityImpl<T extends AbilityImpl<T>> implements Ability {
         this.ruleAtTheTop = ruleAtTheTop;
     }
 
+    @Override
+    public boolean getRuleVisible() {
+        return ruleVisible;
+    }
+
+    @Override
+    public void setRuleVisible(boolean ruleVisible) {
+        this.ruleVisible = ruleVisible;
+    }
+
+
     @Override
     public UUID getOriginalId() {
         return this.originalId;

Mage/src/mage/game/stack/StackAbility.java

@@ -373,6 +373,16 @@ public class StackAbility implements StackObject, Ability {
         this.ability.setRuleAtTheTop(ruleAtTheTop);
     }
 
+    @Override
+    public boolean getRuleVisible() {
+        return this.ability.getRuleVisible();
+    }
+
+    @Override
+    public void setRuleVisible(boolean ruleVisible) {
+        this.ability.setRuleVisible(ruleVisible);
+    }
+
     @Override
     public UUID getOriginalId() {
         return this.ability.getOriginalId();