diff --git a/forge-game/src/main/java/forge/game/mana/ManaPool.java b/forge-game/src/main/java/forge/game/mana/ManaPool.java
index c7424618320..2a571ba0b19 100644
--- a/forge-game/src/main/java/forge/game/mana/ManaPool.java
+++ b/forge-game/src/main/java/forge/game/mana/ManaPool.java
@@ -109,11 +109,15 @@ public class ManaPool implements Iterable<Mana> {
 
         int numRemoved = 0;
         boolean keepGreenMana = isEndOfPhase && this.owner.hasKeyword("Green mana doesn't empty from your mana pool as steps and phases end.");
+        boolean convertToColorless = owner.hasKeyword("Convert unused mana to Colorless");
 
         List<Byte> keys = Lists.newArrayList(floatingMana.keySet());
         if (keepGreenMana) {
             keys.remove(Byte.valueOf(MagicColor.GREEN));
         }
+        if (convertToColorless) {
+            keys.remove(Byte.valueOf(MagicColor.COLORLESS));
+        }
 
         for (Byte b : keys) {
             if (isEndOfPhase && !owner.getGame().getPhaseHandler().is(PhaseType.CLEANUP)) {
@@ -123,19 +127,38 @@ public class ManaPool implements Iterable<Mana> {
                         pMana.add(mana);
                     }
                 }
-                numRemoved += floatingMana.get(b).size() - pMana.size();
-                floatingMana.get(b).clear();
-                floatingMana.putAll(b, pMana);
+                if (convertToColorless) {
+                    floatingMana.get(b).removeAll(pMana);
+                    ConvertManaColor(b, MagicColor.COLORLESS);
+                } else {
+                    numRemoved += floatingMana.get(b).size() - pMana.size();
+                    floatingMana.get(b).clear();
+                    floatingMana.putAll(b, pMana);
+                }
             }
             else {
-                numRemoved += floatingMana.get(b).size();
-                floatingMana.get(b).clear();
+                if (convertToColorless) {
+                    ConvertManaColor(b, MagicColor.COLORLESS);
+                } else {
+                    numRemoved += floatingMana.get(b).size();
+                    floatingMana.get(b).clear();
+                }
             }
         }
+
         owner.getGame().fireEvent(new GameEventManaPool(owner, EventValueChangeType.Cleared, null));
         return numRemoved;
     }
 
+    private void ConvertManaColor(final byte originalColor, final byte toColor) {
+        List<Mana> convert = new ArrayList<Mana>();
+        for (Mana m : floatingMana.get(originalColor)) {
+            convert.add(new Mana(toColor, m.getSourceCard(), m.getManaAbility()));
+        }
+        floatingMana.get(originalColor).clear();
+        floatingMana.putAll(toColor, convert);
+    }
+
     /**
      * <p>
      * removeManaFrom.