diff --git a/Mage.Sets/src/mage/cards/b/BehindTheMask.java b/Mage.Sets/src/mage/cards/b/BehindTheMask.java
new file mode 100644
index 00000000000..bcfb581e219
--- /dev/null
+++ b/Mage.Sets/src/mage/cards/b/BehindTheMask.java
@@ -0,0 +1,53 @@
+package mage.cards.b;
+
+import mage.abilities.condition.common.CollectedEvidenceCondition;
+import mage.abilities.decorator.ConditionalContinuousEffect;
+import mage.abilities.effects.common.continuous.BecomesCreatureTargetEffect;
+import mage.abilities.keyword.CollectEvidenceAbility;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.constants.Duration;
+import mage.filter.StaticFilters;
+import mage.game.permanent.token.custom.CreatureToken;
+import mage.target.TargetPermanent;
+
+import java.util.UUID;
+
+/**
+ * @author xenohedron
+ */
+public final class BehindTheMask extends CardImpl {
+
+    public BehindTheMask(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.INSTANT}, "{U}");
+
+        // As an additional cost to cast this spell, you may collect evidence 6.
+        this.addAbility(new CollectEvidenceAbility(6));
+
+        // Until end of turn, target artifact or creature becomes an artifact creature with base power and toughness 4/3.
+        // If evidence was collected, it has base power and toughness 1/1 until end of turn instead.
+        this.getSpellAbility().addTarget(new TargetPermanent(StaticFilters.FILTER_PERMANENT_ARTIFACT_OR_CREATURE));
+        this.getSpellAbility().addEffect(new ConditionalContinuousEffect(
+                new BecomesCreatureTargetEffect(new CreatureToken(1, 1).withType(CardType.ARTIFACT),
+                        false, false, Duration.EndOfTurn
+                ),
+                new BecomesCreatureTargetEffect(new CreatureToken(4, 3).withType(CardType.ARTIFACT),
+                        false, false, Duration.EndOfTurn
+                ),
+                CollectedEvidenceCondition.instance,
+                "Until end of turn, target artifact or creature becomes an artifact creature with base power and toughness 4/3. " +
+                        "If evidence was collected, it has base power and toughness 1/1 until end of turn instead."
+        ));
+
+    }
+
+    private BehindTheMask(final BehindTheMask card) {
+        super(card);
+    }
+
+    @Override
+    public BehindTheMask copy() {
+        return new BehindTheMask(this);
+    }
+}
diff --git a/Mage.Sets/src/mage/sets/MurdersAtKarlovManor.java b/Mage.Sets/src/mage/sets/MurdersAtKarlovManor.java
index 3a8f076b303..66c3153ba51 100644
--- a/Mage.Sets/src/mage/sets/MurdersAtKarlovManor.java
+++ b/Mage.Sets/src/mage/sets/MurdersAtKarlovManor.java
@@ -44,6 +44,7 @@ public final class MurdersAtKarlovManor extends ExpansionSet {
         cards.add(new SetCardInfo("Axebane Ferox", 153, Rarity.RARE, mage.cards.a.AxebaneFerox.class));
         cards.add(new SetCardInfo("Barbed Servitor", 77, Rarity.RARE, mage.cards.b.BarbedServitor.class));
         cards.add(new SetCardInfo("Basilica Stalker", 78, Rarity.COMMON, mage.cards.b.BasilicaStalker.class));
+        cards.add(new SetCardInfo("Behind the Mask", 39, Rarity.COMMON, mage.cards.b.BehindTheMask.class));
         cards.add(new SetCardInfo("Benthic Criminologists", 40, Rarity.COMMON, mage.cards.b.BenthicCriminologists.class));
         cards.add(new SetCardInfo("Bolrac-Clan Basher", 112, Rarity.UNCOMMON, mage.cards.b.BolracClanBasher.class));
         cards.add(new SetCardInfo("Branch of Vitu-Ghazi", 258, Rarity.UNCOMMON, mage.cards.b.BranchOfVituGhazi.class));