diff --git a/Mage.Sets/src/mage/sets/DragonsMaze.java b/Mage.Sets/src/mage/sets/DragonsMaze.java
index 45c316b308e..1fe91979797 100644
--- a/Mage.Sets/src/mage/sets/DragonsMaze.java
+++ b/Mage.Sets/src/mage/sets/DragonsMaze.java
@@ -84,7 +84,8 @@ public class DragonsMaze extends ExpansionSet {
                 savedCardsInfos = CardRepository.instance.findCards(criteria);
                 savedCards.put(rarity, savedCardsInfos);
             }
-            return savedCardsInfos;
+            // Return a copy of the saved cards information, as not to modify the original.
+            return new ArrayList<>(savedCardsInfos);
         } else {
             return super.getCardsByRarity(rarity);
         }
diff --git a/Mage.Sets/src/mage/sets/FateReforged.java b/Mage.Sets/src/mage/sets/FateReforged.java
index f1126deeb10..76d31b292a2 100644
--- a/Mage.Sets/src/mage/sets/FateReforged.java
+++ b/Mage.Sets/src/mage/sets/FateReforged.java
@@ -81,9 +81,8 @@ public class FateReforged extends ExpansionSet {
                 savedCardsInfos = CardRepository.instance.findCards(criteria);
                 savedCards.put(rarity, savedCardsInfos);
             }
-            List<CardInfo> cards = new ArrayList<>();
-            cards.addAll(savedCardsInfos);
-            return cards;
+            // Return a copy of the saved cards information, as not to modify the original.
+            return new ArrayList<>(savedCardsInfos);
         } else {
             return super.getCardsByRarity(rarity);
         }
diff --git a/Mage/src/mage/cards/ExpansionSet.java b/Mage/src/mage/cards/ExpansionSet.java
index 5c307480558..23c5649fbe3 100644
--- a/Mage/src/mage/cards/ExpansionSet.java
+++ b/Mage/src/mage/cards/ExpansionSet.java
@@ -117,16 +117,11 @@ public abstract class ExpansionSet implements Serializable {
         // if the packs are too big, it removes the first cards.
         // since it adds lands then commons before uncommons
         // and rares this should be the least disruptive.
-
         List<Card> theBooster = this.createBooster();
         List<CardInfo> commons = getCardsByRarity(Rarity.COMMON);
-        int iterations = 0;
-        while (15 > theBooster.size() && !commons.isEmpty()) {
+
+        while (15 > theBooster.size()) {
             addToBooster(theBooster, commons);
-            iterations++;
-            if (iterations > 14) {
-                break;
-            }
         }
 
         while (theBooster.size() > 15) {
@@ -301,9 +296,8 @@ public abstract class ExpansionSet implements Serializable {
             savedCardsInfos = CardRepository.instance.findCards(criteria);
             savedCards.put(rarity, savedCardsInfos);
         }
-        List<CardInfo> cards = new ArrayList<>();
-        cards.addAll(savedCardsInfos);
-        return cards;
+        // Return a copy of the saved cards information, as not to modify the original.
+        return new ArrayList<>(savedCardsInfos);
     }
 
     public List<CardInfo> getSpecialCommon() {