added Feedback (from original limited base set) via generic aura code. With a little luck, this will Just Work.

res/card-pictures.txt

@@ -38,6 +38,7 @@ snow_covered_mountain.jpg        http://www.wizards.com/global/images/magic/gene
 snow_covered_mountain1.jpg       http://www.wizards.com/global/images/magic/general/snow_covered_mountain.jpg
 snow_covered_mountain2.jpg       http://www.magickartenmarkt.de/img/cards/Ice_Age/snow_covered_mountain.jpg
 snow_covered_mountain3.jpg       http://www.magickartenmarkt.de/img/cards/Ice_Age/snow_covered_mountain.jpg
+feedback.jpg					http://www.wizards.com/global/images/magic/general/feedback.jpg
 blight.jpg						http://www.wizards.com/global/images/magic/general/blight.jpg
 sphinx_of_magosi.jpg			http://www.wizards.com/global/images/magic/general/sphinx_of_magosi.jpg
 time_of_heroes.jpg		http://www.wizards.com/global/images/magic/general/time_of_heroes.jpg

res/cards.txt

@@ -1,3 +1,9 @@
+Feedback
+2 U
+Enchantment Aura
+At the beginning of the upkeep of enchanted enchantment's controller, Feedback deals 1 damage to that player.
+Enchant Enchantment Curse
+
 Blight
 B B
 Enchantment Aura

src/forge/GameActionUtil.java

@@ -27,6 +27,7 @@ public class GameActionUtil {
 		upkeep_Honden_of_Nights_Reach();
 		upkeep_Honden_of_Infinite_Rage();
 		upkeep_Land_Tax();
+		upkeep_Feedback();
 		upkeep_Greener_Pastures();
 		upkeep_Wort();
 		upkeep_Squee();
@@ -4806,6 +4807,35 @@ public class GameActionUtil {
 
 	}
 	
+	private static void upkeep_Feedback() {
+        final String player = AllZone.Phase.getActivePlayer();
+        PlayerZone playZone = AllZone.getZone(Constant.Zone.Play, player);
+        
+        CardList list = new CardList(playZone.getCards());
+        list = list.filter(new CardListFilter() {
+            public boolean addCard(Card c) {
+                return c.isEnchantment() && c.isEnchanted();
+            }
+        });
+        
+        if(list.size() > 0) {
+        	Ability ability;
+        	for(Card target:list) {
+        		if(target.isEnchantedBy("Feedback")) {
+        			ability = new Ability(target, "0") {
+                        @Override
+                        public void resolve() {
+                            AllZone.GameAction.getPlayerLife(player).subtractLife(1);
+                        }
+                    };
+                    
+                    ability.setStackDescription("Feedback -  deals 1 damage to "+ player);
+                    AllZone.Stack.add(ability);
+        		}
+        	}
+        }//list > 0
+    }//upkeep_Feedback()
+
 	private static void upkeep_Squee() {
 		final String player = AllZone.Phase.getActivePlayer();
 		//PlayerZone playZone = AllZone.getZone(Constant.Zone.Play, player); //unused