diff --git a/Mage.Sets/src/mage/cards/b/BiomancersFamiliar.java b/Mage.Sets/src/mage/cards/b/BiomancersFamiliar.java
index e6518e1d41..7767c8baeb 100644
--- a/Mage.Sets/src/mage/cards/b/BiomancersFamiliar.java
+++ b/Mage.Sets/src/mage/cards/b/BiomancersFamiliar.java
@@ -74,14 +74,7 @@ class BiomancersFamiliarCostReductionEffect extends CostModificationEffectImpl {
         if (controller == null) {
             return false;
         }
-        Mana mana = abilityToModify.getManaCostsToPay().getMana();
-        int reduceMax = mana.getGeneric();
-        if (reduceMax > 0 && mana.count() == mana.getGeneric()) {
-            reduceMax--;
-        }
-        if (reduceMax > 2) {
-            reduceMax = 2;
-        }
+        int reduceMax = CardUtil.calculateActualPossibleGenericManaReduction(abilityToModify.getManaCostsToPay().getMana(), 2, 1);        
         if (reduceMax <= 0) {
             return true;
         }
diff --git a/Mage.Sets/src/mage/cards/h/Heartstone.java b/Mage.Sets/src/mage/cards/h/Heartstone.java
index 65c244fea5..3aca43a06f 100644
--- a/Mage.Sets/src/mage/cards/h/Heartstone.java
+++ b/Mage.Sets/src/mage/cards/h/Heartstone.java
@@ -14,6 +14,7 @@ import mage.players.Player;
 import mage.util.CardUtil;
 
 import java.util.UUID;
+import mage.Mana;
 
 /**
  * @author pcasaretto_at_gmail.com
@@ -42,8 +43,7 @@ public final class Heartstone extends CardImpl {
 class HeartstoneEffect extends CostModificationEffectImpl {
 
     private static final String effectText = "Activated abilities of creatures cost "
-            + "{1} less to activate. This effect can't reduce the mana in that cost to less than one mana.";
-    private static final FilterCreaturePermanent filter = new FilterCreaturePermanent();
+            + "{1} less to activate. This effect can't reduce the mana in that cost to less than one mana";
 
     public HeartstoneEffect() {
         super(Duration.Custom, Outcome.Benefit, CostModificationType.REDUCE_COST);
@@ -58,7 +58,11 @@ class HeartstoneEffect extends CostModificationEffectImpl {
     public boolean apply(Game game, Ability source, Ability abilityToModify) {
         Player controller = game.getPlayer(abilityToModify.getControllerId());
         if (controller != null) {
-            CardUtil.reduceCost(abilityToModify, 1);
+            int reduceMax = CardUtil.calculateActualPossibleGenericManaReduction(abilityToModify.getManaCostsToPay().getMana(), 1, 1);            
+            if (reduceMax <= 0) {
+                return true;
+            }            
+            CardUtil.reduceCost(abilityToModify, reduceMax);
             return true;
         }
         return false;
@@ -71,10 +75,7 @@ class HeartstoneEffect extends CostModificationEffectImpl {
                 && (abilityToModify instanceof ActivatedAbility))) {
             // Activated abilities of creatures
             Permanent permanent = game.getPermanentOrLKIBattlefield(abilityToModify.getSourceId());
-            if (permanent != null
-                    && filter.match(permanent, source.getSourceId(), source.getControllerId(), game)) {
-                return true;
-            }
+            return permanent != null && permanent.isCreature();
         }
         return false;
     }
diff --git a/Mage.Sets/src/mage/cards/p/PowerArtifact.java b/Mage.Sets/src/mage/cards/p/PowerArtifact.java
index dbf2a960ab..bc477661ea 100644
--- a/Mage.Sets/src/mage/cards/p/PowerArtifact.java
+++ b/Mage.Sets/src/mage/cards/p/PowerArtifact.java
@@ -35,8 +35,8 @@ public final class PowerArtifact extends CardImpl {
         Ability ability = new EnchantAbility(auraTarget.getTargetName());
         this.addAbility(ability);
 
-        // Enchanted artifact's activated abilities cost less to activate.
-        // This effect can't reduce the amount of mana an ability costs to activate to less than one mana.
+        // Enchanted artifact's activated abilities cost {2} less to activate. 
+        // This effect can't reduce the mana in that cost to less than one mana.
         this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, new PowerArtifactCostModificationEffect()));
     }
 
@@ -55,7 +55,7 @@ class PowerArtifactCostModificationEffect extends CostModificationEffectImpl {
     PowerArtifactCostModificationEffect() {
         super(Duration.WhileOnBattlefield, Outcome.Benefit, CostModificationType.REDUCE_COST);
         staticText = "Enchanted artifact's activated abilities cost {2} less to activate. "
-                + "This effect can't reduce the amount of mana an ability costs to activate to less than one mana.";
+                + "This effect can't reduce the mana in that cost to less than one mana";
 
     }
 
@@ -67,15 +67,11 @@ class PowerArtifactCostModificationEffect extends CostModificationEffectImpl {
     public boolean apply(Game game, Ability source, Ability abilityToModify) {
         Player controller = game.getPlayer(abilityToModify.getControllerId());
         if (controller != null) {
-            Mana mana = abilityToModify.getManaCostsToPay().getMana();
-            int reduce = mana.getGeneric();
-            if (reduce > 0 && mana.count() == mana.getGeneric()) {
-                reduce--;
-            }
-            if (reduce > 2) {
-                reduce = 2;
-            }
-            CardUtil.reduceCost(abilityToModify, reduce);
+            int reduceMax = CardUtil.calculateActualPossibleGenericManaReduction(abilityToModify.getManaCostsToPay().getMana(), 2, 1);            
+            if (reduceMax <= 0) {
+                return true;
+            }            
+            CardUtil.reduceCost(abilityToModify, reduceMax);
         }
         return true;
     }
diff --git a/Mage.Sets/src/mage/cards/t/TrainingGrounds.java b/Mage.Sets/src/mage/cards/t/TrainingGrounds.java
index 4e4488b5d4..14e5770001 100644
--- a/Mage.Sets/src/mage/cards/t/TrainingGrounds.java
+++ b/Mage.Sets/src/mage/cards/t/TrainingGrounds.java
@@ -61,14 +61,7 @@ class TrainingGroundsEffect extends CostModificationEffectImpl {
         if (controller == null) {
             return false;
         }
-        Mana mana = abilityToModify.getManaCostsToPay().getMana();
-        int reduceMax = mana.getGeneric();
-        if (reduceMax > 0 && mana.count() == mana.getGeneric()) {
-            reduceMax--;
-        }
-        if (reduceMax > 2) {
-            reduceMax = 2;
-        }
+        int reduceMax = CardUtil.calculateActualPossibleGenericManaReduction(abilityToModify.getManaCostsToPay().getMana(), 2, 1);
         if (reduceMax <= 0) {
             return true;
         }
diff --git a/Mage.Sets/src/mage/cards/z/ZirdaTheDawnwaker.java b/Mage.Sets/src/mage/cards/z/ZirdaTheDawnwaker.java
index f86246c513..1efe933963 100644
--- a/Mage.Sets/src/mage/cards/z/ZirdaTheDawnwaker.java
+++ b/Mage.Sets/src/mage/cards/z/ZirdaTheDawnwaker.java
@@ -91,7 +91,7 @@ class ZirdaTheDawnwakerEffect extends CostModificationEffectImpl {
     ZirdaTheDawnwakerEffect() {
         super(Duration.Custom, Outcome.Benefit, CostModificationType.REDUCE_COST);
         staticText = "Abilities you activate that aren't mana abilities cost {2} less to activate. "
-                + "This effect can't reduce the mana in that cost to less than one mana.";
+                + "This effect can't reduce the mana in that cost to less than one mana";
     }
 
     private ZirdaTheDawnwakerEffect(final ZirdaTheDawnwakerEffect effect) {
@@ -100,13 +100,7 @@ class ZirdaTheDawnwakerEffect extends CostModificationEffectImpl {
 
     @Override
     public boolean apply(Game game, Ability source, Ability abilityToModify) {
-        Mana mana = abilityToModify.getManaCostsToPay().getMana();
-        int reduceMax = mana.getGeneric();
-        if (reduceMax > 0
-                && mana.count() == mana.getGeneric()) {
-            reduceMax--;
-        }
-        reduceMax = Math.min(reduceMax, 2);
+        int reduceMax = CardUtil.calculateActualPossibleGenericManaReduction(abilityToModify.getManaCostsToPay().getMana(), 2, 1);        
         if (reduceMax <= 0) {
             return true;
         }
diff --git a/Mage/src/main/java/mage/util/CardUtil.java b/Mage/src/main/java/mage/util/CardUtil.java
index 33b016c412..90d2e36ca7 100644
--- a/Mage/src/main/java/mage/util/CardUtil.java
+++ b/Mage/src/main/java/mage/util/CardUtil.java
@@ -72,6 +72,25 @@ public final class CardUtil {
         adjustAbilityCost(ability, -increaseCount);
     }
 
+    /**
+     * calculates the maximal possible generic mana reduction for a given mana cost
+     *
+     * @param mana mana costs that should be reduced
+     * @param maxPossibleReduction max possible generic mana reduction 
+     * @param notLessThan the complete costs may not be reduced more than this CMC mana costs
+     */
+    public static int calculateActualPossibleGenericManaReduction(Mana mana, int maxPossibleReduction, int notLessThan) {
+        int nonGeneric = mana.count() - mana.getGeneric();
+        int notPossibleGenericReduction = Math.max(0, notLessThan - nonGeneric);
+        int actualPossibleGenericManaReduction = Math.max(0, mana.getGeneric() - notPossibleGenericReduction);
+        if (actualPossibleGenericManaReduction > maxPossibleReduction) {
+            actualPossibleGenericManaReduction = maxPossibleReduction;
+        }        
+        return actualPossibleGenericManaReduction;
+    }
+    
+    
+    
     /**
      * Reduces ability cost to be paid.
      *