diff --git a/Mage/src/mage/abilities/effects/common/DevourEffect.java b/Mage/src/mage/abilities/effects/common/DevourEffect.java
index bbe8238f4d..d4aac57628 100644
--- a/Mage/src/mage/abilities/effects/common/DevourEffect.java
+++ b/Mage/src/mage/abilities/effects/common/DevourEffect.java
@@ -131,8 +131,10 @@ public class DevourEffect extends ReplacementEffectImpl<DevourEffect> {
                     int devouredCreatures = target.getTargets().size();
                     game.informPlayers(new StringBuilder(creature.getName()).append(" devours ").append(devouredCreatures).append(" creatures").toString());
                     for (UUID targetId: target.getTargets()) {
-                        Permanent targetCreature  = game.getPermanent(targetId);
-                        cardSubtypes.add((ArrayList<String>) targetCreature.getSubtype());
+                        Permanent targetCreature = game.getPermanent(targetId);
+                        if (targetCreature != null) {
+                            cardSubtypes.add((ArrayList<String>) targetCreature.getSubtype());
+                        }
                         if (targetCreature == null || !targetCreature.sacrifice(source.getSourceId(), game)) {
                             return false;
                         }
diff --git a/Mage/src/mage/abilities/effects/common/RegenerateAttachedEffect.java b/Mage/src/mage/abilities/effects/common/RegenerateAttachedEffect.java
index dd9d142ed9..d5fc24fb56 100644
--- a/Mage/src/mage/abilities/effects/common/RegenerateAttachedEffect.java
+++ b/Mage/src/mage/abilities/effects/common/RegenerateAttachedEffect.java
@@ -62,8 +62,11 @@ public class RegenerateAttachedEffect extends ReplacementEffectImpl<RegenerateAt
     public boolean apply(Game game, Ability source) {
         //20110204 - 701.11
         Permanent permanent = game.getPermanent(source.getSourceId());
+        if (permanent == null) {
+            return false;
+        }
         Permanent equipped = game.getPermanent(permanent.getAttachedTo());
-        if (permanent != null && equipped.regenerate(this.getId(), game)) {
+        if (equipped != null && equipped.regenerate(this.getId(), game)) {
             this.used = true;
             return true;
         }
diff --git a/Mage/src/mage/abilities/keyword/ConvokeAbility.java b/Mage/src/mage/abilities/keyword/ConvokeAbility.java
index 4704916d71..663f8d1774 100644
--- a/Mage/src/mage/abilities/keyword/ConvokeAbility.java
+++ b/Mage/src/mage/abilities/keyword/ConvokeAbility.java
@@ -83,8 +83,6 @@ import mage.util.CardUtil;
  *
  * @author LevelX2
  */
-
-
 public class ConvokeAbility extends SimpleStaticAbility implements AdjustingSourceCosts {
 
     private static final FilterControlledCreaturePermanent filter = new FilterControlledCreaturePermanent();
@@ -123,47 +121,51 @@ public class ConvokeAbility extends SimpleStaticAbility implements AdjustingSour
                 int adjCost = 0;
                 for (UUID creatureId: target.getTargets()) {
                     Permanent perm = game.getPermanent(creatureId);
-                    if (perm!= null) {
-                        Card card = game.getCard(perm.getId());
-                        ManaCosts manaCostsCreature = card.getSpellAbility().getManaCosts();
-                        if (card != null && manaCostsCreature != null && manaCostsCreature.convertedManaCost() > 0) {
-                            if (perm.tap(game)) {
-                                Choice chooseManaType = buildChoice(manaCostsCreature, ability.getManaCostsToPay());
-                                if (chooseManaType.getChoices().size() > 0) {
-                                    if (chooseManaType.getChoices().size() > 1) {
-                                        chooseManaType.getChoices().add("Colorless");
-                                        chooseManaType.setMessage("Choose mana color to reduce from " + perm.getName());
-                                        while (!chooseManaType.isChosen()) {
-                                            player.choose(Outcome.Benefit, chooseManaType, game);
-                                        }
-                                    } else {
-                                        chooseManaType.setChoice(chooseManaType.getChoices().iterator().next());
-                                    }
+                    if (perm == null) {
+                        continue;
+                    }
 
-                                    ManaCosts manaCostsToReduce = new ManaCostsImpl();
-                                    if (chooseManaType.getChoice().equals("Black")) {
-                                        manaCostsToReduce.load("{B}");
-                                    }
-                                    if (chooseManaType.getChoice().equals("Blue")) {
-                                        manaCostsToReduce.load("{U}");
-                                    }
-                                    if (chooseManaType.getChoice().equals("Green")) {
-                                        manaCostsToReduce.load("{G}");
-                                    }
-                                    if (chooseManaType.getChoice().equals("White")) {
-                                        manaCostsToReduce.load("{W}");
-                                    }
-                                    if (chooseManaType.getChoice().equals("Red")) {
-                                        manaCostsToReduce.load("{R}");
-                                    }
-                                    if (chooseManaType.getChoice().equals("Colorless")) {
-                                        ++adjCost;
-                                    }
-                                    CardUtil.adjustCost((SpellAbility)ability, manaCostsToReduce);
-                                } else {
-                                    ++adjCost;
+                    Card card = game.getCard(perm.getId());
+                    if (card == null) {
+                        continue;
+                    }
+
+                    ManaCosts manaCostsCreature = card.getSpellAbility().getManaCosts();
+                    if (manaCostsCreature != null && manaCostsCreature.convertedManaCost() > 0 && perm.tap(game)) {
+                        Choice chooseManaType = buildChoice(manaCostsCreature, ability.getManaCostsToPay());
+                        if (chooseManaType.getChoices().size() > 0) {
+                            if (chooseManaType.getChoices().size() > 1) {
+                                chooseManaType.getChoices().add("Colorless");
+                                chooseManaType.setMessage("Choose mana color to reduce from " + perm.getName());
+                                while (!chooseManaType.isChosen()) {
+                                    player.choose(Outcome.Benefit, chooseManaType, game);
                                 }
+                            } else {
+                                chooseManaType.setChoice(chooseManaType.getChoices().iterator().next());
                             }
+
+                            ManaCosts manaCostsToReduce = new ManaCostsImpl();
+                            if (chooseManaType.getChoice().equals("Black")) {
+                                manaCostsToReduce.load("{B}");
+                            }
+                            if (chooseManaType.getChoice().equals("Blue")) {
+                                manaCostsToReduce.load("{U}");
+                            }
+                            if (chooseManaType.getChoice().equals("Green")) {
+                                manaCostsToReduce.load("{G}");
+                            }
+                            if (chooseManaType.getChoice().equals("White")) {
+                                manaCostsToReduce.load("{W}");
+                            }
+                            if (chooseManaType.getChoice().equals("Red")) {
+                                manaCostsToReduce.load("{R}");
+                            }
+                            if (chooseManaType.getChoice().equals("Colorless")) {
+                                ++adjCost;
+                            }
+                            CardUtil.adjustCost((SpellAbility)ability, manaCostsToReduce);
+                        } else {
+                            ++adjCost;
                         }
                     }
                 }
@@ -200,4 +202,3 @@ public class ConvokeAbility extends SimpleStaticAbility implements AdjustingSour
       return "Convoke <i>(Each creature you tap while casting this spell reduces its cost by {1} or by one mana of that creature's color.)</i>";
     }
 }
-
diff --git a/Mage/src/mage/target/common/TargetCreatureOrPlayer.java b/Mage/src/mage/target/common/TargetCreatureOrPlayer.java
index bcb516c297..e1417a15f0 100644
--- a/Mage/src/mage/target/common/TargetCreatureOrPlayer.java
+++ b/Mage/src/mage/target/common/TargetCreatureOrPlayer.java
@@ -89,8 +89,9 @@ public class TargetCreatureOrPlayer extends TargetImpl<TargetCreatureOrPlayer> {
             return filter.match(permanent, game);
         }
         Player player = game.getPlayer(id);
-        if (player != null)
+        if (player != null) {
             return filter.match(player, game);
+        }
         return false;
     }
 
@@ -101,20 +102,24 @@ public class TargetCreatureOrPlayer extends TargetImpl<TargetCreatureOrPlayer> {
 
     public boolean canTarget(UUID controllerId, UUID id, Ability source, Game game) {
         Permanent permanent = game.getPermanent(id);
-        MageObject targetSource = game.getObject(source.getSourceId());
-        if (permanent != null) {
-            if (source != null)
-                //TODO: check for replacement effects
-                return permanent.canBeTargetedBy(game.getObject(source.getSourceId()), controllerId, game) && filter.match(permanent, source.getSourceId(), controllerId, game);
-            else
-                return filter.match(permanent, source.getSourceId(), controllerId, game);
-        }
         Player player = game.getPlayer(id);
-        if (player != null)
-            if (source != null)
+
+        if (source != null) {
+            MageObject targetSource = game.getObject(source.getSourceId());
+            if (permanent != null) {
+                return permanent.canBeTargetedBy(targetSource, source.getControllerId(), game) && filter.match(permanent, source.getSourceId(), source.getControllerId(), game);
+            }
+            if (player != null) {
                 return player.canBeTargetedBy(targetSource, game) && filter.match(player, game);
-            else
-                return filter.match(player, game);
+            }
+        }
+
+        if (permanent != null) {
+            return filter.match(permanent, game);
+        }
+        if (player != null) {
+            return filter.match(player, game);
+        }
         return false;
     }
 
@@ -135,15 +140,17 @@ public class TargetCreatureOrPlayer extends TargetImpl<TargetCreatureOrPlayer> {
             Player player = game.getPlayer(playerId);
             if (player != null && player.canBeTargetedBy(targetSource, game) && filter.match(player, game)) {
                 count++;
-                if (count >= this.minNumberOfTargets)
+                if (count >= this.minNumberOfTargets) {
                     return true;
+                }
             }
         }
         for (Permanent permanent: game.getBattlefield().getActivePermanents(new FilterCreaturePermanent(), sourceControllerId, game)) {
             if (permanent.canBeTargetedBy(targetSource, sourceControllerId, game) && filter.match(permanent, sourceId, sourceControllerId, game)) {
                 count++;
-                if (count >= this.minNumberOfTargets)
+                if (count >= this.minNumberOfTargets) {
                     return true;
+                }
             }
         }
         return false;
@@ -164,15 +171,17 @@ public class TargetCreatureOrPlayer extends TargetImpl<TargetCreatureOrPlayer> {
             Player player = game.getPlayer(playerId);
             if (player != null && filter.match(player, game)) {
                 count++;
-                if (count >= this.minNumberOfTargets)
+                if (count >= this.minNumberOfTargets) {
                     return true;
+                }
             }
         }
         for (Permanent permanent: game.getBattlefield().getActivePermanents(new FilterCreaturePermanent(), sourceControllerId, game)) {
             if (filter.match(permanent, null, sourceControllerId, game)) {
                 count++;
-                if (count >= this.minNumberOfTargets)
+                if (count >= this.minNumberOfTargets) {
                     return true;
+                }
             }
         }
         return false;
diff --git a/Mage/src/mage/target/common/TargetCreatureOrPlayerAmount.java b/Mage/src/mage/target/common/TargetCreatureOrPlayerAmount.java
index bce52eee5c..372b059d9a 100644
--- a/Mage/src/mage/target/common/TargetCreatureOrPlayerAmount.java
+++ b/Mage/src/mage/target/common/TargetCreatureOrPlayerAmount.java
@@ -75,27 +75,33 @@ public class TargetCreatureOrPlayerAmount extends TargetAmount<TargetCreatureOrP
             return filter.match(permanent, game);
         }
         Player player = game.getPlayer(id);
-        if (player != null)
+        if (player != null) {
             return filter.match(player, game);
+        }
         return false;
     }
 
     @Override
     public boolean canTarget(UUID id, Ability source, Game game) {
         Permanent permanent = game.getPermanent(id);
-        MageObject targetSource = game.getObject(source.getSourceId());
-        if (permanent != null) {
-            if (source != null)
-                return permanent.canBeTargetedBy(targetSource, source.getControllerId(), game) && filter.match(permanent, source.getSourceId(), source.getControllerId(), game);
-            else
-                return filter.match(permanent, game);
-        }
         Player player = game.getPlayer(id);
-        if (player != null)
-            if (source != null)
+
+        if (source != null) {
+            MageObject targetSource = game.getObject(source.getSourceId());
+            if (permanent != null) {
+                return permanent.canBeTargetedBy(targetSource, source.getControllerId(), game) && filter.match(permanent, source.getSourceId(), source.getControllerId(), game);
+            }
+            if (player != null) {
                 return player.canBeTargetedBy(targetSource, game) && filter.match(player, game);
-            else
-                return filter.match(player, game);
+            }
+        }
+
+        if (permanent != null) {
+            return filter.match(permanent, game);
+        }
+        if (player != null) {
+            return filter.match(player, game);
+        }
         return false;
     }
 
@@ -107,15 +113,17 @@ public class TargetCreatureOrPlayerAmount extends TargetAmount<TargetCreatureOrP
             Player player = game.getPlayer(playerId);
             if (player != null && player.canBeTargetedBy(targetSource, game) && filter.match(player, game)) {
                 count++;
-                if (count >= this.minNumberOfTargets)
+                if (count >= this.minNumberOfTargets) {
                     return true;
+                }
             }
         }
         for (Permanent permanent: game.getBattlefield().getActivePermanents(new FilterCreaturePermanent(), sourceControllerId, game)) {
             if (permanent.canBeTargetedBy(targetSource, sourceControllerId, game) && filter.match(permanent, sourceId, sourceControllerId, game)) {
                 count++;
-                if (count >= this.minNumberOfTargets)
+                if (count >= this.minNumberOfTargets) {
                     return true;
+                }
             }
         }
         return false;
@@ -128,15 +136,17 @@ public class TargetCreatureOrPlayerAmount extends TargetAmount<TargetCreatureOrP
             Player player = game.getPlayer(playerId);
             if (player != null && filter.match(player, game)) {
                 count++;
-                if (count >= this.minNumberOfTargets)
+                if (count >= this.minNumberOfTargets) {
                     return true;
+                }
             }
         }
         for (Permanent permanent: game.getBattlefield().getActivePermanents(new FilterCreaturePermanent(), sourceControllerId, game)) {
             if (filter.match(permanent, null, sourceControllerId, game)) {
                 count++;
-                if (count >= this.minNumberOfTargets)
+                if (count >= this.minNumberOfTargets) {
                     return true;
+                }
             }
         }
         return false;
diff --git a/Mage/src/mage/target/common/TargetCreaturePermanentAmount.java b/Mage/src/mage/target/common/TargetCreaturePermanentAmount.java
index 5bad8b5687..115cd8f329 100644
--- a/Mage/src/mage/target/common/TargetCreaturePermanentAmount.java
+++ b/Mage/src/mage/target/common/TargetCreaturePermanentAmount.java
@@ -82,9 +82,9 @@ public class TargetCreaturePermanentAmount extends TargetAmount<TargetCreaturePe
     @Override
     public boolean canTarget(UUID id, Ability source, Game game) {
         Permanent permanent = game.getPermanent(id);
-        MageObject targetSource = game.getObject(source.getSourceId());
         if (permanent != null) {
             if (source != null) {
+                MageObject targetSource = game.getObject(source.getSourceId());
                 return permanent.canBeTargetedBy(targetSource, source.getControllerId(), game) && filter.match(permanent, source.getSourceId(), source.getControllerId(), game);
             } else {
                 return filter.match(permanent, game);
diff --git a/Mage/src/mage/target/common/TargetPermanentOrPlayer.java b/Mage/src/mage/target/common/TargetPermanentOrPlayer.java
index 290e156e4e..2ac383358a 100644
--- a/Mage/src/mage/target/common/TargetPermanentOrPlayer.java
+++ b/Mage/src/mage/target/common/TargetPermanentOrPlayer.java
@@ -97,27 +97,33 @@ public class TargetPermanentOrPlayer extends TargetImpl<TargetPermanentOrPlayer>
             return filter.match(permanent, game);
         }
         Player player = game.getPlayer(id);
-        if (player != null)
+        if (player != null) {
             return filter.match(player, game);
+        }
         return false;
     }
 
     @Override
     public boolean canTarget(UUID id, Ability source, Game game) {
         Permanent permanent = game.getPermanent(id);
-        MageObject targetSource = game.getObject(source.getSourceId());
-        if (permanent != null) {
-            if (source != null)
-                return permanent.canBeTargetedBy(targetSource, source.getControllerId(), game) && filter.match(permanent, source.getSourceId(), source.getControllerId(), game);
-            else
-                return filter.match(permanent, game);
-        }
         Player player = game.getPlayer(id);
-        if (player != null)
-            if (source != null)
+
+        if (source != null) {
+            MageObject targetSource = game.getObject(source.getSourceId());
+            if (permanent != null) {
+                return permanent.canBeTargetedBy(targetSource, source.getControllerId(), game) && filter.match(permanent, source.getSourceId(), source.getControllerId(), game);
+            }
+            if (player != null) {
                 return player.canBeTargetedBy(targetSource, game) && filter.match(player, game);
-            else
-                return filter.match(player, game);
+            }
+        }
+
+        if (permanent != null) {
+            return filter.match(permanent, game);
+        }
+        if (player != null) {
+            return filter.match(player, game);
+        }
         return false;
     }
 
@@ -138,15 +144,17 @@ public class TargetPermanentOrPlayer extends TargetImpl<TargetPermanentOrPlayer>
             Player player = game.getPlayer(playerId);
             if (player != null && player.canBeTargetedBy(targetSource, game) && filter.match(player, game)) {
                 count++;
-                if (count >= this.minNumberOfTargets)
+                if (count >= this.minNumberOfTargets) {
                     return true;
+                }
             }
         }
         for (Permanent permanent: game.getBattlefield().getActivePermanents(new FilterCreaturePermanent(), sourceControllerId, game)) {
             if (permanent.canBeTargetedBy(targetSource, sourceControllerId, game) && filter.match(permanent, sourceId, sourceControllerId, game)) {
                 count++;
-                if (count >= this.minNumberOfTargets)
+                if (count >= this.minNumberOfTargets) {
                     return true;
+                }
             }
         }
         return false;
@@ -167,15 +175,17 @@ public class TargetPermanentOrPlayer extends TargetImpl<TargetPermanentOrPlayer>
             Player player = game.getPlayer(playerId);
             if (player != null && filter.match(player, game)) {
                 count++;
-                if (count >= this.minNumberOfTargets)
+                if (count >= this.minNumberOfTargets) {
                     return true;
+                }
             }
         }
         for (Permanent permanent: game.getBattlefield().getActivePermanents(filterPermanent, sourceControllerId, game)) {
             if (filter.match(permanent, null, sourceControllerId, game) && filter.match(permanent, game)) {
                 count++;
-                if (count >= this.minNumberOfTargets)
+                if (count >= this.minNumberOfTargets) {
                     return true;
+                }
             }
         }
         return false;
diff --git a/Mage/src/mage/target/common/TargetSpellOrPermanent.java b/Mage/src/mage/target/common/TargetSpellOrPermanent.java
index 0e4c027a88..9eca3270f7 100644
--- a/Mage/src/mage/target/common/TargetSpellOrPermanent.java
+++ b/Mage/src/mage/target/common/TargetSpellOrPermanent.java
@@ -104,24 +104,27 @@ public class TargetSpellOrPermanent extends TargetImpl<TargetSpellOrPermanent> {
             return filter.match(permanent, game);
         }
         Spell spell = game.getStack().getSpell(id);
-        if (spell != null)
+        if (spell != null) {
             return filter.match(spell, game);
+        }
         return false;
     }
 
     @Override
     public boolean canTarget(UUID id, Ability source, Game game) {
         Permanent permanent = game.getPermanent(id);
-        MageObject targetSource = game.getObject(source.getSourceId());
         if (permanent != null) {
-            if (source != null)
+            if (source != null) {
+                MageObject targetSource = game.getObject(source.getSourceId());
                 return permanent.canBeTargetedBy(targetSource, source.getControllerId(), game) && filter.match(permanent, source.getSourceId(), source.getControllerId(), game);
-            else
+            } else {
                 return filter.match(permanent, game);
+            }
         }
         Spell spell = game.getStack().getSpell(id);
-        if (spell != null)
+        if (spell != null) {
             return filter.match(spell, game);
+        }
         return false;
     }
 
@@ -142,15 +145,17 @@ public class TargetSpellOrPermanent extends TargetImpl<TargetSpellOrPermanent> {
             Spell spell = game.getStack().getSpell(stackObject.getId());
             if (spell != null && filter.match(spell, sourceId, sourceControllerId, game)) {
                 count++;
-                if (count >= this.minNumberOfTargets)
+                if (count >= this.minNumberOfTargets) {
                     return true;
+                }
             }
         }
         for (Permanent permanent: game.getBattlefield().getActivePermanents(new FilterCreaturePermanent(), sourceControllerId, game)) {
             if (permanent.canBeTargetedBy(targetSource, sourceControllerId, game) && filter.match(permanent, sourceId, sourceControllerId, game)) {
                 count++;
-                if (count >= this.minNumberOfTargets)
+                if (count >= this.minNumberOfTargets) {
                     return true;
+                }
             }
         }
         return false;
@@ -171,15 +176,17 @@ public class TargetSpellOrPermanent extends TargetImpl<TargetSpellOrPermanent> {
             Spell spell = game.getStack().getSpell(stackObject.getId());
             if (spell != null && filter.match(spell, null, sourceControllerId, game) && filter.match(spell, game)) {
                 count++;
-                if (count >= this.minNumberOfTargets)
+                if (count >= this.minNumberOfTargets) {
                     return true;
+                }
             }
         }
         for (Permanent permanent: game.getBattlefield().getActivePermanents(filterPermanent, sourceControllerId, game)) {
             if (filter.match(permanent, null, sourceControllerId, game) && filter.match(permanent, game)) {
                 count++;
-                if (count >= this.minNumberOfTargets)
+                if (count >= this.minNumberOfTargets) {
                     return true;
+                }
             }
         }
         return false;
diff --git a/Mage/src/mage/util/CardUtil.java b/Mage/src/mage/util/CardUtil.java
index 5a4b84d1b0..becfbf174b 100644
--- a/Mage/src/mage/util/CardUtil.java
+++ b/Mage/src/mage/util/CardUtil.java
@@ -55,8 +55,9 @@ public class CardUtil {
      */
     public static boolean shareTypes(Card card1, Card card2) {
 
-        if (card1 == null || card2 == null)
+        if (card1 == null || card2 == null) {
             throw new IllegalArgumentException("Params can't be null");
+        }
 
         for (Constants.CardType type : card1.getCardType()) {
             if (card2.getCardType().contains(type)) {
@@ -75,8 +76,9 @@ public class CardUtil {
      */
     public static boolean shareSubtypes(Card card1, Card card2) {
 
-        if (card1 == null || card2 == null)
+        if (card1 == null || card2 == null) {
             throw new IllegalArgumentException("Params can't be null");
+        }
 
         for (String subtype : card1.getSubtype()) {
             if (card2.getSubtype().contains(subtype)) {
@@ -108,8 +110,8 @@ public class CardUtil {
         boolean reduced = false;
         for (ManaCost manaCost : previousCost) {
             Mana mana = manaCost.getOptions().get(0);
-            int colorless = mana.getColorless();
-            if (!reduced && mana != null && colorless > 0) {
+            int colorless = mana != null ? mana.getColorless() : 0;
+            if (!reduced && colorless > 0) {
                 if ((colorless - reduceCount) > 0) {
                     int newColorless = colorless - reduceCount;
                     adjustedCost.add(new GenericManaCost(newColorless));