diff --git a/Mage.Sets/src/mage/cards/s/SecretsOfTheMausoleum.java b/Mage.Sets/src/mage/cards/s/SecretsOfTheMausoleum.java
new file mode 100644
index 0000000000..fe8f5c1ee7
--- /dev/null
+++ b/Mage.Sets/src/mage/cards/s/SecretsOfTheMausoleum.java
@@ -0,0 +1,75 @@
+package mage.cards.s;
+
+import java.util.UUID;
+import mage.ObjectColor;
+import mage.abilities.Ability;
+import mage.abilities.effects.OneShotEffect;
+import mage.abilities.effects.common.search.SearchLibraryPutInHandEffect;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.constants.ComparisonType;
+import mage.constants.Outcome;
+import mage.filter.FilterCard;
+import mage.filter.StaticFilters;
+import mage.filter.predicate.mageobject.ColorPredicate;
+import mage.filter.predicate.mageobject.ConvertedManaCostPredicate;
+import mage.game.Game;
+import mage.players.Player;
+import mage.target.common.TargetCardInLibrary;
+
+/**
+ *
+ * @author TheElk801
+ */
+public final class SecretsOfTheMausoleum extends CardImpl {
+
+    public SecretsOfTheMausoleum(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.INSTANT}, "{1}{B}");
+
+        // Undergrowth — Search your library for a black card with converted mana cost equal to or less than the number of creature cards in your graveyard, reveal it, put it into your hand, then shuffle your library.
+        this.getSpellAbility().addEffect(new SecretsOfTheMausoleumEffect());
+    }
+
+    public SecretsOfTheMausoleum(final SecretsOfTheMausoleum card) {
+        super(card);
+    }
+
+    @Override
+    public SecretsOfTheMausoleum copy() {
+        return new SecretsOfTheMausoleum(this);
+    }
+}
+
+class SecretsOfTheMausoleumEffect extends OneShotEffect {
+
+    public SecretsOfTheMausoleumEffect() {
+        super(Outcome.Benefit);
+        this.staticText = "<i>Undergrowth</i> &mdash; Search your library "
+                + "for a black card with converted mana cost less than "
+                + "or equal to the number of creature cards in your graveyard, "
+                + "reveal it, put it into your hand, then shuffle your library.";
+    }
+
+    public SecretsOfTheMausoleumEffect(final SecretsOfTheMausoleumEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public SecretsOfTheMausoleumEffect copy() {
+        return new SecretsOfTheMausoleumEffect(this);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        Player player = game.getPlayer(source.getControllerId());
+        if (player == null) {
+            return false;
+        }
+        int critterCount = player.getGraveyard().count(StaticFilters.FILTER_CARD_CREATURE, game);
+        FilterCard filter = new FilterCard("a black card with converted mana cost less than or equal to " + critterCount);
+        filter.add(new ColorPredicate(ObjectColor.BLACK));
+        filter.add(new ConvertedManaCostPredicate(ComparisonType.FEWER_THAN, critterCount + 1));
+        return new SearchLibraryPutInHandEffect(new TargetCardInLibrary(filter), true).apply(game, source);
+    }
+}
diff --git a/Mage.Sets/src/mage/sets/GuildsOfRavnica.java b/Mage.Sets/src/mage/sets/GuildsOfRavnica.java
index c4c08f1fe4..b0918620b7 100644
--- a/Mage.Sets/src/mage/sets/GuildsOfRavnica.java
+++ b/Mage.Sets/src/mage/sets/GuildsOfRavnica.java
@@ -87,6 +87,7 @@ public final class GuildsOfRavnica extends ExpansionSet {
         cards.add(new SetCardInfo("Rosemane Centaur", 197, Rarity.COMMON, mage.cards.r.RosemaneCentaur.class));
         cards.add(new SetCardInfo("Runaway Steam-Kin", 115, Rarity.RARE, mage.cards.r.RunawaySteamKin.class));
         cards.add(new SetCardInfo("Sacred Foundry", 254, Rarity.RARE, mage.cards.s.SacredFoundry.class));
+        cards.add(new SetCardInfo("Secrets of the Mausoleum", 75, Rarity.RARE, mage.cards.s.SecretsOfTheMausoleum.class));
         cards.add(new SetCardInfo("Selesnya Guildgate", 255, Rarity.COMMON, mage.cards.s.SelesnyaGuildgate.class));
         cards.add(new SetCardInfo("Selesnya Guildgate", 256, Rarity.COMMON, mage.cards.s.SelesnyaGuildgate.class));
         cards.add(new SetCardInfo("Sinister Sabotage", 54, Rarity.UNCOMMON, mage.cards.s.SinisterSabotage.class));