curiosity...

2/1/2007 You draw one card each time the enchanted creature damages the
opponent. This is not one card per point of damage.
2/1/2007 If put on your opponent's creature, you do not draw a card when
that creature damages you. The creature has to damage your opponent in
order to have this work.
2/1/2007 Drawing a card is optional. If you forget, you can't go back
later and do it, even if it is something you normally do.
9/22/2011 "You" refers to the controller of Curiosity, which may be
different from the controller of the enchanted creature."An opponent"
refers to an opponent of Curiosity's controller.
9/22/2011 Any damage dealt by the enchanted creature to an opponent will
cause Curiosity to trigger, not just combat damage.
9/22/2011 Curiosity doesn't trigger if the enchanted creature deals
damage to a planeswalker controlled by an opponent.

projects/mtg/include/AllAbilities.h

@@ -1300,7 +1300,8 @@ public:
     bool sourceUntapped;
     bool limitOnceATurn;
     int triggeredTurn;
-    bool thiscontroller, thisopponent;
+    bool thiscontroller;
+    bool thisopponent;
     TrDamaged(GameObserver* observer, int id, MTGCardInstance * source, TargetChooser * tc, TargetChooser * fromTc = NULL, int type = 0,bool sourceUntapped = false,bool limitOnceATurn = false,bool once = false, bool thiscontroller = false, bool thisopponent = false) :
         Trigger(observer, id, source, once, tc), fromTc(fromTc), type(type) , sourceUntapped(sourceUntapped),limitOnceATurn(limitOnceATurn),thiscontroller(thiscontroller),thisopponent(thisopponent)
     {
@@ -1321,12 +1322,11 @@ public:
         if (type == 2 && e->damage->typeOfDamage == Damage::DAMAGE_COMBAT) return 0;
         if (e->damage->target->type_as_damageable == Damageable::DAMAGEABLE_PLAYER)
         {
-            Player * p = (Player *) e->damage->target;
             if(thiscontroller)
-                if(p != source->controller())
+                if(e->damage->target != (Damageable *)source->controller())
                     return 0;
             if(thisopponent)
-                if(p == source->controller())
+                if(e->damage->target == (Damageable *)source->controller())
                     return 0;
         }
         e->damage->target->thatmuch = e->damage->damage;