* Doubling Cube - Added support for possible mana calculation (related to #6698).

Mage/src/main/java/mage/abilities/mana/ManaAbility.java

@@ -8,6 +8,7 @@ package mage.abilities.mana;
 import java.util.List;
 import java.util.Set;
 import mage.Mana;
+import mage.abilities.Ability;
 import mage.constants.ManaType;
 import mage.game.Game;
 
@@ -25,6 +26,17 @@ public interface ManaAbility {
      * @return
      */
     List<Mana> getNetMana(Game game);
+    
+    /**
+     * Used to check the possible mana production to determine which spells
+     * and/or abilities can be used. (player.getPlayable()).
+     * Only used for abilities were the poolDependant flag is set
+     *
+     * @param game
+     * @param possibleManaInPool The possible mana already produced by other sources for this calculation option
+     * @return 
+     */
+    List<Mana> getNetMana(Game game, Mana possibleManaInPool);
 
     /**
      * The type of mana a permanent "could produce" is the type of mana that any
@@ -45,4 +57,16 @@ public interface ManaAbility {
      * @return
      */
     boolean definesMana(Game game);
+
+    /**
+     * Set to true if the ability is dependant from the mana pool. E.g. the more
+     * mana the pool contains the more mana the ability can produce (Doubling
+     * Cube). Therefore the use of that ability after other mana abilities does produce more mana.
+     *
+     * @return
+     */
+    boolean isPoolDependant();
+    
+    ManaAbility setPoolDependant(boolean pooleDependant);
+    
 }