- Fix for CostInputs not handling X set to 0.

src/main/java/forge/card/cost/CostDiscard.java

@@ -225,6 +225,10 @@ public class CostDiscard extends CostPartWithList {
     
             @Override
             public void showMessage() {
+                if (nNeeded == 0){
+                    done();
+                }
+                
                 if (AllZone.getHumanHand().size() == 0) stop();
                 StringBuilder type = new StringBuilder("");
                 if (!discType.equals("Card")) {

src/main/java/forge/card/cost/CostExile.java

@@ -189,6 +189,10 @@ public class CostExile extends CostPartWithList {
     
             @Override
             public void showMessage() {
+                if (nNeeded == 0){
+                    done();
+                }
+                
                 typeList = AllZoneUtil.getCardsInZone(part.getFrom(), sa.getActivatingPlayer());
                 typeList = typeList.getValidCards(type.split(";"), sa.getActivatingPlayer(), sa.getSourceCard());
     
@@ -249,6 +253,10 @@ public class CostExile extends CostPartWithList {
     
             @Override
             public void showMessage() {
+                if (nNeeded == 0){
+                    done();
+                }
+                
                 StringBuilder msg = new StringBuilder("Exile ");
                 int nLeft = nNeeded - nExiles;
                 msg.append(nLeft).append(" ");

src/main/java/forge/card/cost/CostReturn.java

@@ -133,6 +133,10 @@ public class CostReturn extends CostPartWithList {
     
             @Override
             public void showMessage() {
+                if (nNeeded == 0){
+                    done();
+                }
+                
                 StringBuilder msg = new StringBuilder("Return ");
                 int nLeft = nNeeded - nReturns;
                 msg.append(nLeft).append(" ");

src/main/java/forge/card/cost/CostReveal.java

@@ -155,6 +155,10 @@ public class CostReveal extends CostPartWithList {
     
             @Override
             public void showMessage() {
+                if (nNeeded == 0){
+                    done();
+                }
+                
                 if (AllZone.getHumanHand().size() < nNeeded) stop();
                 StringBuilder type = new StringBuilder("");
                 if (!discType.equals("Card")) {

src/main/java/forge/card/cost/CostSacrifice.java

@@ -172,6 +172,10 @@ public class CostSacrifice extends CostPartWithList {
     
             @Override
             public void showMessage() {
+                if (nNeeded == 0){
+                    done();
+                }
+                
                 StringBuilder msg = new StringBuilder("Sacrifice ");
                 int nLeft = nNeeded - nSacrifices;
                 msg.append(nLeft).append(" ");

src/main/java/forge/card/cost/CostTapType.java

@@ -133,6 +133,10 @@ public class CostTapType extends CostPartWithList {
     
             @Override
             public void showMessage() {
+                if (nCards == 0){
+                    done();
+                }
+                
                 if (cardList.size() == 0) stop();
     
                 int left = nCards - nTapped;