compare with zero in a more delicate way

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

@@ -78,7 +78,7 @@ public class Cost {
      * @return a boolean.
      */
     public final boolean hasNoManaCost() {
-        return this.getTotalMana().toString().equals(ManaCost.ZERO.toString());
+        return this.getTotalMana().isZero();
     }
 
     /**

src/main/java/forge/card/mana/ManaCost.java

@@ -183,6 +183,10 @@ public final class ManaCost implements Comparable<ManaCost> {
         return this.shards.isEmpty() && !this.isNoCost();
     }
 
+    public boolean isZero() {
+        return genericCost == 0 && isPureGeneric();
+    }
+    
     /*
      * (non-Javadoc)
      *