Added Tetravus (to enable it I had to add a YChoice svar and ChosenY value. Only added to CostExile, not the other cost types)

src/main/java/forge/Card.java

@@ -470,7 +470,7 @@ public class Card extends GameEntity implements Comparable<Card> {
     private final ArrayList<Command> untapCommandList = new ArrayList<Command>();
     private final ArrayList<Command> changeControllerCommandList = new ArrayList<Command>();
 
-    private static String[] storableSVars = { "ChosenX" };
+    private static String[] storableSVars = { "ChosenX", "ChosenY" };
 
     private final ArrayList<Card> hauntedBy = new ArrayList<Card>();
     private Card haunting = null;

src/main/java/forge/card/abilityfactory/AbilityFactory.java

@@ -760,9 +760,9 @@ public class AbilityFactory {
                 spellAbility = AbilityFactoryEffect.createDrawbackEffect(this);
             }
         }
-        
+
         else if (this.api.equals("EndTurn")) {
-            if(this.isAb) {
+            if (this.isAb) {
                 spellAbility = AbilityFactoryTurns.createAbilityEndTurn(this);
             } else if (this.isSp) {
                 spellAbility = AbilityFactoryTurns.createSpellEndTurn(this);
@@ -1673,7 +1673,7 @@ public class AbilityFactory {
                 return 0;
             }
         }
-        if (amount.equals("ChosenX")) {
+        if (amount.equals("ChosenX") || amount.equals("ChosenY")) {
             // isn't made yet
             return 0;
         }

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

@@ -189,7 +189,11 @@ public class CostExile extends CostPartWithList {
             // Generalize this
             if (sVar.equals("XChoice")) {
                 c = CostUtil.chooseXValue(source, list.size());
-            } else {
+            }
+            if (sVar.equals("YChoice")) {
+                c = CostUtil.chooseYValue(source, list.size());
+            }
+            else {
                 c = AbilityFactory.calculateAmount(source, amount, ability);
             }
         }
@@ -226,6 +230,10 @@ public class CostExile extends CostPartWithList {
                     return false;
                 }
 
+                if (sVar.equals("YChoice")) {
+                        return false;
+                }
+
                 c = AbilityFactory.calculateAmount(source, this.getAmount(), ability);
             }
 

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

@@ -248,6 +248,8 @@ public class CostUtil {
             // Generalize this
             if (sVar.equals("XChoice")) {
                 c = CostUtil.chooseXValue(source, maxChoice);
+            } if (sVar.equals("YChoice")) {
+                c = CostUtil.chooseYValue(source, maxChoice);
             } else {
                 c = AbilityFactory.calculateAmount(source, amount, ability);
             }
@@ -281,6 +283,32 @@ public class CostUtil {
         return chosenX;
     }
 
+    /**
+     * Choose x value (for ChosenY).
+     * 
+     * @param card
+     *            the card
+     * @param maxValue
+     *            the max value
+     * @return the int
+     */
+    public static int chooseYValue(final Card card, final int maxValue) {
+        final String chosen = card.getSVar("ChosenY");
+        if (chosen.length() > 0) {
+            return AbilityFactory.calculateAmount(card, "ChosenY", null);
+        }
+
+        final Integer[] choiceArray = new Integer[maxValue + 1];
+        for (int i = 0; i < choiceArray.length; i++) {
+            choiceArray[i] = i;
+        }
+        final Object o = GuiUtils.getChoice(card.toString() + " - Choose a Value for Y", choiceArray);
+        final int chosenY = (Integer) o;
+        card.setSVar("ChosenY", "Number$" + Integer.toString(chosenY));
+
+        return chosenY;
+    }
+
     /**
      * <p>
      * setInput.