- Cleanup of old references to the mana pool as a card.

src/main/java/forge/GameAction.java

@@ -1088,8 +1088,8 @@ public class GameAction {
      * @return a boolean.
      */
     public final boolean sacrifice(final Card c) {
-        if (c.getName().equals("Mana Pool")) {
-            System.out.println("Trying to sacrifice mana pool...");
+        if (c.isImmutable()) {
+            System.out.println("Trying to sacrifice immutables");
             return false;
         }
         this.sacrificeDestroy(c);

src/main/java/forge/GameActionUtil.java

@@ -1382,7 +1382,7 @@ public final class GameActionUtil {
                     type = type.filter(new CardListFilter() {
                         @Override
                         public boolean addCard(final Card card) {
-                            return !card.equals(crd) && card.isCreature() && !crd.getName().equals("Mana Pool");
+                            return !card.equals(crd) && card.isCreature();
                         }
                     });
                     final CardList alreadyAdded = new CardList();