diff --git a/Mage.Sets/src/mage/cards/m/MildManneredLibrarian.java b/Mage.Sets/src/mage/cards/m/MildManneredLibrarian.java
new file mode 100644
index 00000000000..42664ab1631
--- /dev/null
+++ b/Mage.Sets/src/mage/cards/m/MildManneredLibrarian.java
@@ -0,0 +1,44 @@
+package mage.cards.m;
+
+import java.util.UUID;
+import mage.MageInt;
+import mage.abilities.Ability;
+import mage.abilities.common.ActivateOncePerGameActivatedAbility;
+import mage.abilities.costs.mana.ManaCostsImpl;
+import mage.abilities.effects.common.DrawCardSourceControllerEffect;
+import mage.abilities.effects.common.continuous.AddCardSubTypeSourceEffect;
+import mage.abilities.effects.common.counter.AddCountersSourceEffect;
+import mage.constants.*;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.counters.CounterType;
+
+/**
+ * @author xenohedron
+ */
+public final class MildManneredLibrarian extends CardImpl {
+
+    public MildManneredLibrarian(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{G}");
+        
+        this.subtype.add(SubType.HUMAN);
+        this.power = new MageInt(1);
+        this.toughness = new MageInt(1);
+
+        // {3}{G}: Mild-Mannered Librarian becomes a Werewolf. Put two +1/+1 counters on it and you draw a card. Activate only once.
+        Ability ability = new ActivateOncePerGameActivatedAbility(Zone.BATTLEFIELD, new AddCardSubTypeSourceEffect(Duration.Custom, SubType.WEREWOLF),
+                new ManaCostsImpl<>("{3}{G}"), TimingRule.INSTANT);
+        ability.addEffect(new AddCountersSourceEffect(CounterType.P1P1.createInstance(2)).setText("Put two +1/+1 counters on it"));
+        ability.addEffect(new DrawCardSourceControllerEffect(1).setText("and you draw a card"));
+        this.addAbility(ability);
+    }
+
+    private MildManneredLibrarian(final MildManneredLibrarian card) {
+        super(card);
+    }
+
+    @Override
+    public MildManneredLibrarian copy() {
+        return new MildManneredLibrarian(this);
+    }
+}
diff --git a/Mage.Sets/src/mage/sets/Jumpstart2022.java b/Mage.Sets/src/mage/sets/Jumpstart2022.java
index 64dcfb8f7ea..5c5e87ee18f 100644
--- a/Mage.Sets/src/mage/sets/Jumpstart2022.java
+++ b/Mage.Sets/src/mage/sets/Jumpstart2022.java
@@ -475,6 +475,7 @@ public final class Jumpstart2022 extends ExpansionSet {
         cards.add(new SetCardInfo("Michiko Konda, Truth Seeker", 215, Rarity.RARE, mage.cards.m.MichikoKondaTruthSeeker.class));
         cards.add(new SetCardInfo("Midnight Guard", 216, Rarity.COMMON, mage.cards.m.MidnightGuard.class));
         cards.add(new SetCardInfo("Might of the Masses", 690, Rarity.COMMON, mage.cards.m.MightOfTheMasses.class));
+        cards.add(new SetCardInfo("Mild-Mannered Librarian", 41, Rarity.UNCOMMON, mage.cards.m.MildManneredLibrarian.class));
         cards.add(new SetCardInfo("Military Intelligence", 322, Rarity.UNCOMMON, mage.cards.m.MilitaryIntelligence.class));
         cards.add(new SetCardInfo("Miraculous Recovery", 217, Rarity.UNCOMMON, mage.cards.m.MiraculousRecovery.class));
         cards.add(new SetCardInfo("Mire Blight", 442, Rarity.COMMON, mage.cards.m.MireBlight.class));
diff --git a/Mage/src/main/java/mage/abilities/effects/common/continuous/AddCardSubTypeSourceEffect.java b/Mage/src/main/java/mage/abilities/effects/common/continuous/AddCardSubTypeSourceEffect.java
index 357383fc194..d3fa4d3f4e9 100644
--- a/Mage/src/main/java/mage/abilities/effects/common/continuous/AddCardSubTypeSourceEffect.java
+++ b/Mage/src/main/java/mage/abilities/effects/common/continuous/AddCardSubTypeSourceEffect.java
@@ -7,10 +7,12 @@ import mage.abilities.effects.ContinuousEffectImpl;
 import mage.constants.*;
 import mage.game.Game;
 import mage.game.permanent.Permanent;
+import mage.util.CardUtil;
 
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
-import java.util.Locale;
+import java.util.stream.Collectors;
 
 /**
  * @author TheElk801
@@ -27,9 +29,7 @@ public class AddCardSubTypeSourceEffect extends ContinuousEffectImpl {
     public AddCardSubTypeSourceEffect(Duration duration, boolean inAddition, SubType... addedSubType) {
         super(duration, Layer.TypeChangingEffects_4, SubLayer.NA, Outcome.Benefit);
         this.inAddition = inAddition;
-        for (SubType cardType : addedSubType) {
-            this.addedSubTypes.add(cardType);
-        }
+        this.addedSubTypes.addAll(Arrays.asList(addedSubType));
     }
 
     private AddCardSubTypeSourceEffect(final AddCardSubTypeSourceEffect effect) {
@@ -71,24 +71,13 @@ public class AddCardSubTypeSourceEffect extends ContinuousEffectImpl {
         if (staticText != null && !staticText.isEmpty()) {
             return staticText;
         }
-        StringBuilder sb = new StringBuilder();
-        sb.append("{this} becomes ");
-        boolean article = false;
-        for (SubType subType : addedSubTypes) {
-            if (!article) {
-                if (subType.toString().startsWith("A") || subType.toString().startsWith("E")) {
-                    sb.append("an ");
-                } else {
-                    sb.append("a ");
-                }
-                article = true;
-            }
-            sb.append(subType.toString().toLowerCase(Locale.ENGLISH)).append(" ");
-        }
-        if (inAddition) {
-            sb.append(" in addition to its other types ");
-        }
-        sb.append(this.getDuration().toString());
-        return sb.toString();
+        String subTypeText = addedSubTypes
+                .stream()
+                .map(SubType::toString)
+                .collect(Collectors.joining(" "));
+        return "{this} becomes "
+                + CardUtil.addArticle(subTypeText)
+                + (inAddition ? " in addition to its other types" : "")
+                + (duration.toString().isEmpty() ? "" : ' ' + duration.toString());
     }
 }