* Fixed a problem of the improvise ability that prevented to pay costs during the resolution of the spell cast using improvise (e.g. Metallic Rebike).

Mage/src/main/java/mage/game/stack/Spell.java

@@ -161,6 +161,7 @@ public class Spell extends StackObjImpl implements Card {
                 }
             }
         }
+        setDoneActivatingManaAbilities(false); // can be activated again maybe during the resolution of the spell (e.g. Metallic Rebuke)
         return true;
     }