diff --git a/forge-ai/src/main/java/forge/ai/ability/ChangeZoneAi.java b/forge-ai/src/main/java/forge/ai/ability/ChangeZoneAi.java
index 1aab95f2a05..2c5144ba3f3 100644
--- a/forge-ai/src/main/java/forge/ai/ability/ChangeZoneAi.java
+++ b/forge-ai/src/main/java/forge/ai/ability/ChangeZoneAi.java
@@ -1419,8 +1419,8 @@ public class ChangeZoneAi extends SpellAbilityAi {
     private boolean doSacAndUpgradeLogic(final Player ai, SpellAbility sa) {
         Card source = sa.getHostCard();
         PhaseHandler ph = ai.getGame().getPhaseHandler();
-        boolean sacWorst = sa.getParam("AILogic").contains("SacWorst");
-        boolean anyCMC = sa.getParam("AILogic").contains("GoalAnyCMC");
+        String logic = sa.getParam("AILogic");
+        boolean sacWorst = logic.contains("SacWorst");
 
         if (!ph.is(PhaseType.MAIN2)) {
             // Should be given a chance to cast other spells as well as to use a previously upgraded creature
@@ -1428,28 +1428,31 @@ public class ChangeZoneAi extends SpellAbilityAi {
         }
 
         String definedSac = StringUtils.split(source.getSVar("AIPreference"), "$")[1];
-        String definedGoal = sa.hasParam("AISearchGoal") ? sa.getParam("AISearchGoal") : "Creature";
-
-        String overridePrefix = definedGoal.contains(".") ? definedGoal + "+" : definedGoal + ".";
+        String definedGoal = sa.getParam("ChangeType");
+        boolean anyCMC = !definedGoal.contains(".cmc");
 
         CardCollection listToSac = CardLists.filter(ai.getCardsIn(ZoneType.Battlefield), CardPredicates.restriction(definedSac.split(","), ai, source, sa));
         listToSac.sort(!sacWorst ? CardLists.CmcComparatorInv : Collections.reverseOrder(CardLists.CmcComparatorInv));
 
-        CardCollection listLib = CardLists.filter(ai.getCardsIn(ZoneType.Library), CardPredicates.restriction(definedGoal.split(","), ai, source, sa));
-
         for (Card sacCandidate : listToSac) {
             int sacCMC = sacCandidate.getCMC();
-            int goalCMC = sacCMC + 1;
 
-            CardCollection listGoal = new CardCollection(listLib);
+            int goalCMC = source.hasSVar("X") ? AbilityUtils.calculateAmount(source, source.getSVar("X").replace("Sacrificed$CardManaCost", "Number$" + sacCMC), sa) : sacCMC + 1;
+            String curGoal = definedGoal;
 
             if (!anyCMC) {
-                // e.g. Birthing Pod - ensure we have a valid card to upgrade to
-                listGoal = CardLists.getValidCards(listGoal, overridePrefix + "cmcEQ" + goalCMC, source.getController(), source);
-            } else {
-                // e.g. Natural Order - ensure we're upgrading to something better
-                listGoal = CardLists.getValidCards(listGoal, overridePrefix + "cmcGE" + goalCMC, source.getController(), source);
+                // TODO: improve the detection of X in the "cmc**X" part to avoid clashing with other letters in the definition
+                curGoal = definedGoal.replace("X", String.format("%d", goalCMC));
             }
+
+            CardCollection listGoal = CardLists.filter(ai.getCardsIn(ZoneType.Library), CardPredicates.restriction(curGoal.split(","), ai, source, sa));
+
+            if (!anyCMC) {
+                listGoal = CardLists.getValidCards(listGoal, curGoal, source.getController(), source);
+            } else {
+                listGoal = CardLists.getValidCards(listGoal, curGoal + (curGoal.contains(".") ? "+" : ".") + "cmcGE" + goalCMC, source.getController(), source);
+            }
+
             listGoal = CardLists.filter(listGoal, new Predicate<Card>() {
                 @Override
                 public boolean apply(final Card c) {
diff --git a/forge-gui/res/cardsfolder/e/eldritch_evolution.txt b/forge-gui/res/cardsfolder/e/eldritch_evolution.txt
index 1d7f4f74c1b..e94c2acb4ee 100644
--- a/forge-gui/res/cardsfolder/e/eldritch_evolution.txt
+++ b/forge-gui/res/cardsfolder/e/eldritch_evolution.txt
@@ -1,8 +1,9 @@
 Name:Eldritch Evolution
 ManaCost:1 G G
 Types:Sorcery
-A:SP$ ChangeZone | Cost$ 1 G G Sac<1/Creature> | Origin$ Library | Destination$ Battlefield | ChangeType$ Creature.cmcLEX | ChangeNum$ 1 | References$ X | SubAbility$ DBChange | StackDescription$ SpellDescription | SpellDescription$ Search your library for a creature card with converted mana cost X or less, where X is 2 plus the sacrificed creature's converted mana cost. Put that card onto the battlefield, then shuffle your library. Exile CARDNAME.
+A:SP$ ChangeZone | Cost$ 1 G G Sac<1/Creature> | Origin$ Library | Destination$ Battlefield | ChangeType$ Creature.cmcLEX | ChangeNum$ 1 | References$ X | SubAbility$ DBChange | AILogic$ SacAndUpgrade+SacWorst | StackDescription$ SpellDescription | SpellDescription$ Search your library for a creature card with converted mana cost X or less, where X is 2 plus the sacrificed creature's converted mana cost. Put that card onto the battlefield, then shuffle your library. Exile CARDNAME.
 SVar:DBChange:DB$ ChangeZone | Origin$ Stack | Destination$ Exile 
 SVar:X:Sacrificed$CardManaCost/Plus.2
+SVar:AIPreference:SacCost$Creature
 SVar:Picture:http://www.wizards.com/global/images/magic/general/eldritch_evolution.jpg
 Oracle:As an additional cost to cast Eldritch Evolution, sacrifice a creature.\nSearch your library for a creature card with converted mana cost X or less, where X is 2 plus the sacrificed creature's converted mana cost. Put that card onto the battlefield, then shuffle your library. Exile Eldritch Evolution.
\ No newline at end of file
diff --git a/forge-gui/res/cardsfolder/n/natural_order.txt b/forge-gui/res/cardsfolder/n/natural_order.txt
index 2f461a548e7..37c93dadc9a 100644
--- a/forge-gui/res/cardsfolder/n/natural_order.txt
+++ b/forge-gui/res/cardsfolder/n/natural_order.txt
@@ -1,7 +1,7 @@
 Name:Natural Order
 ManaCost:2 G G
 Types:Sorcery
-A:SP$ ChangeZone | Cost$ 2 G G Sac<1/Creature.Green/green creature> | Origin$ Library | Destination$ Battlefield | ChangeType$ Creature.Green | ChangeNum$ 1 | AILogic$ SacAndUpgrade.SacWorst+GoalAnyCMC | AISearchGoal$ Creature.Green | SpellDescription$ Search your library for a green creature card and put it onto the battlefield. Then shuffle your library.
+A:SP$ ChangeZone | Cost$ 2 G G Sac<1/Creature.Green/green creature> | Origin$ Library | Destination$ Battlefield | ChangeType$ Creature.Green | ChangeNum$ 1 | AILogic$ SacAndUpgrade.SacWorst | AISearchGoal$ Creature.Green | SpellDescription$ Search your library for a green creature card and put it onto the battlefield. Then shuffle your library.
 # AI Preference is needed to make the AI consider the ability. Further constraints are defined by AILogic SacAndUpgrade.
 SVar:AIPreference:SacCost$Creature.Green
 SVar:Picture:http://www.wizards.com/global/images/magic/general/natural_order.jpg