Surge: don't use OptionalCost there

forge-game/src/main/java/forge/game/card/CardFactoryUtil.java

@@ -4088,7 +4088,7 @@ public class CardFactoryUtil {
 
             newSA.setPayCosts(surgeCost);
             newSA.setBasicSpell(false);
-            newSA.addOptionalCost(OptionalCost.Surge);
+            newSA.setSurged(true);
 
             String desc = "Surge " + surgeCost.toSimpleString() + " (" + inst.getReminderText()
                     + ")";

forge-game/src/main/java/forge/game/spellability/OptionalCost.java

@@ -11,7 +11,6 @@ public enum OptionalCost {
     Kicker1("Kicker"),
     Kicker2("Kicker"),
     Retrace("Retrace"),
-    Surge("Surge"), // no real OptionalCost but used there
     AltCost(""), // used by prowl
     Flash("Flash"),
     Generic("Generic"); // used by "Dragon Presence" and pseudo-kicker cards

forge-game/src/main/java/forge/game/spellability/SpellAbility.java

@@ -97,6 +97,7 @@ public abstract class SpellAbility extends CardTraitBase implements ISpellAbilit
     private boolean cycling = false;
     private boolean dash = false;
     private boolean evoke = false;
+    private boolean surge = false;
     private boolean offering = false;
     private boolean emerge = false;
     private boolean morphup = false;
@@ -510,10 +511,6 @@ public abstract class SpellAbility extends CardTraitBase implements ISpellAbilit
             getMultiKickerManaCost() != null;
     }
 
-    public boolean isSurged() {
-        return isOptionalCostPaid(OptionalCost.Surge);
-    }
-
     public boolean isEntwine() {
         return isOptionalCostPaid(OptionalCost.Entwine);
     }
@@ -1072,6 +1069,14 @@ public abstract class SpellAbility extends CardTraitBase implements ISpellAbilit
         evoke = isEvoke;
     }
 
+    public final boolean isSurged() {
+        return surge;
+    }
+
+    public final void setSurged(final boolean isSurge) {
+        surge = isSurge;
+    }
+
     public CardCollection getTappedForConvoke() {
         return tappedForConvoke;
     }