diff --git a/src/magic/model/condition/MagicCondition.java b/src/magic/model/condition/MagicCondition.java
index 867e001aff..74695d3a4c 100644
--- a/src/magic/model/condition/MagicCondition.java
+++ b/src/magic/model/condition/MagicCondition.java
@@ -950,4 +950,14 @@ public abstract class MagicCondition implements MagicMatchedCostEvent {
             return player.controlsPermanent(MagicTargetFilterFactory.LEGENDARY_CREATURE_OR_PLANESWALKER);
         }
     };
+
+    public static MagicCondition ADDENDUM = new MagicCondition() {
+        @Override
+        public boolean accept(final MagicSource source) {
+            final MagicCardOnStack spell = (MagicCardOnStack)source;
+            final MagicGame game = source.getGame();
+            final MagicPhaseType phaseType = game.getPhase().getType();
+            return spell.isCast() && spell.isController(game.getTurnPlayer()) && (phaseType == MagicPhaseType.FirstMain || phaseType == MagicPhaseType.SecondMain);
+        }
+    };
 }
diff --git a/src/magic/model/condition/MagicConditionParser.java b/src/magic/model/condition/MagicConditionParser.java
index 6ec542b8c6..db115dbe0d 100644
--- a/src/magic/model/condition/MagicConditionParser.java
+++ b/src/magic/model/condition/MagicConditionParser.java
@@ -799,6 +799,12 @@ public enum MagicConditionParser {
             return MagicCondition.HAS_THE_CITYS_BLESSING;
         }
     },
+    Addendum("you cast this spell during your main phase") {
+        @Override
+        public MagicCondition toCondition(final Matcher arg) {
+            return MagicCondition.ADDENDUM;
+        }
+    },
     ;
 
     private final Pattern pattern;