* Fixed a problem with emerge, that the spell could not be cast with emerge, if the player had less mana available as the full emerge mana costs.

Mage/src/main/java/mage/abilities/ActivatedAbility.java

@@ -24,11 +24,11 @@
 * The views and conclusions contained in the software and documentation are those of the
 * authors and should not be interpreted as representing official policies, either expressed
 * or implied, of BetaSteward_at_googlemail.com.
-*/
-
+ */
 package mage.abilities;
 
 import java.util.UUID;
+import mage.abilities.mana.ManaOptions;
 import mage.game.Game;
 
 /**
@@ -38,20 +38,30 @@ import mage.game.Game;
 public interface ActivatedAbility extends Ability {
 
     boolean canActivate(UUID playerId, Game game);
-    
+
+    /**
+     * Returns the minimal possible cost for what the ability can be activated
+     * or cast
+     *
+     * @param playerId
+     * @param game
+     * @return
+     */
+    ManaOptions getMinimumCostToActivate(UUID playerId, Game game);
+
     /**
      * Creates a fresh copy of this activated ability.
-     * 
+     *
      * @return A new copy of this ability.
      */
     @Override
-    ActivatedAbility copy();   
-    
+    ActivatedAbility copy();
+
     /**
-     * Set a flag to know, that the ability is only created adn used to check 
+     * Set a flag to know, that the ability is only created adn used to check
      * what's playbable for the player.
      */
     void setCheckPlayableMode();
-    
+
     boolean isCheckPlayableMode();
 }

Mage/src/main/java/mage/abilities/ActivatedAbilityImpl.java

@@ -34,6 +34,7 @@ import mage.abilities.costs.mana.ManaCosts;
 import mage.abilities.costs.mana.PhyrexianManaCost;
 import mage.abilities.effects.Effect;
 import mage.abilities.effects.Effects;
+import mage.abilities.mana.ManaOptions;
 import mage.cards.Card;
 import mage.constants.AbilityType;
 import mage.constants.AsThoughEffectType;
@@ -199,6 +200,11 @@ public abstract class ActivatedAbilityImpl extends AbilityImpl implements Activa
         return false;
     }
 
+    @Override
+    public ManaOptions getMinimumCostToActivate(UUID playerId, Game game) {
+        return getManaCostsToPay().getOptions();
+    }
+
     protected boolean controlsAbility(UUID playerId, Game game) {
         if (this.controllerId != null && this.controllerId.equals(playerId)) {
             return true;

Mage/src/main/java/mage/abilities/keyword/EmergeAbility.java

@@ -28,10 +28,12 @@
 package mage.abilities.keyword;
 
 import java.util.UUID;
+import mage.Mana;
 import mage.abilities.SpellAbility;
 import mage.abilities.costs.common.SacrificeTargetCost;
 import mage.abilities.costs.mana.ManaCost;
 import mage.abilities.costs.mana.ManaCosts;
+import mage.abilities.mana.ManaOptions;
 import mage.cards.Card;
 import mage.constants.Outcome;
 import mage.constants.SpellAbilityType;
@@ -84,6 +86,26 @@ public class EmergeAbility extends SpellAbility {
         return false;
     }
 
+    @Override
+    public ManaOptions getMinimumCostToActivate(UUID playerId, Game game) {
+        int maxCMC = 0;
+        for (Permanent creature : game.getBattlefield().getActivePermanents(new FilterControlledCreaturePermanent(), playerId, this.getSourceId(), game)) {
+            int cmc = creature.getConvertedManaCost();
+            if (cmc > maxCMC) {
+                maxCMC = cmc;
+            }
+        }
+        ManaOptions manaOptions = super.getMinimumCostToActivate(playerId, game);
+        for (Mana mana : manaOptions) {
+            if (mana.getGeneric() > maxCMC) {
+                mana.setGeneric(mana.getGeneric() - maxCMC);
+            } else {
+                mana.setGeneric(0);
+            }
+        }
+        return manaOptions;
+    }
+
     @Override
     public boolean activate(Game game, boolean noMana) {
         Player controller = game.getPlayer(this.getControllerId());

Mage/src/main/java/mage/players/PlayerImpl.java

@@ -2489,7 +2489,7 @@ public abstract class PlayerImpl implements Player, Serializable {
                 canBeCastRegularly = false;
             }
             if (canBeCastRegularly) {
-                ManaOptions abilityOptions = copy.getManaCostsToPay().getOptions();
+                ManaOptions abilityOptions = copy.getMinimumCostToActivate(playerId, game);
                 if (abilityOptions.isEmpty()) {
                     return true;
                 } else {