diff --git a/Mage.Tests/src/test/java/org/mage/test/cards/abilities/keywords/DayNightTest.java b/Mage.Tests/src/test/java/org/mage/test/cards/abilities/keywords/DayNightTest.java
index 3ce078d3f4d..3a58e0dad27 100644
--- a/Mage.Tests/src/test/java/org/mage/test/cards/abilities/keywords/DayNightTest.java
+++ b/Mage.Tests/src/test/java/org/mage/test/cards/abilities/keywords/DayNightTest.java
@@ -1,8 +1,10 @@
 package org.mage.test.cards.abilities.keywords;
 
+import mage.cards.Card;
 import mage.constants.PhaseStep;
 import mage.constants.Zone;
 import mage.game.permanent.Permanent;
+import mage.util.CardUtil;
 import org.junit.Assert;
 import org.junit.Ignore;
 import org.junit.Test;
@@ -59,6 +61,41 @@ public class DayNightTest extends CardTestPlayerBase {
         assertRuffianSmasher(true);
     }
 
+    @Test
+    public void testCopy() {
+        // possible bug: stack overflow on copy
+        addCard(Zone.HAND, playerA, ruffian);
+
+        runCode("copy", 1, PhaseStep.PRECOMBAT_MAIN, playerA, (info, player, game) -> {
+            Card card = currentGame.getCards().stream().filter(c -> c.getName().equals(ruffian)).findFirst().orElse(null);
+            Assert.assertNotNull(card);
+            Assert.assertNotNull(card.getSecondCardFace());
+
+            // original
+            Assert.assertNotNull(card.getSecondCardFace());
+            // copy
+            Card copy = card.copy();
+            Assert.assertNotNull(copy.getSecondCardFace());
+            // deep copy
+            copy = CardUtil.deepCopyObject(card);
+            Assert.assertNotNull(copy.getSecondCardFace());
+
+            // copied
+            Card copied = game.copyCard(card, null, playerA.getId());
+            Assert.assertNotNull(copied.getSecondCardFace());
+            // copy
+            copy = copied.copy();
+            Assert.assertNotNull(copy.getSecondCardFace());
+            // deep copy
+            copy = CardUtil.deepCopyObject(copied);
+            Assert.assertNotNull(copy.getSecondCardFace());
+        });
+
+        setStrictChooseMode(true);
+        setStopAt(1, PhaseStep.END_TURN);
+        execute();
+    }
+
     @Test
     public void testNightbound() {
         currentGame.setDaytime(false);
diff --git a/Mage/src/main/java/mage/cards/ModalDoubleFacedCard.java b/Mage/src/main/java/mage/cards/ModalDoubleFacedCard.java
index eb8f3fcd19f..f5f81daebd0 100644
--- a/Mage/src/main/java/mage/cards/ModalDoubleFacedCard.java
+++ b/Mage/src/main/java/mage/cards/ModalDoubleFacedCard.java
@@ -62,10 +62,14 @@ public abstract class ModalDoubleFacedCard extends CardImpl implements CardWithH
 
     public ModalDoubleFacedCard(ModalDoubleFacedCard card) {
         super(card);
-        this.leftHalfCard = card.getLeftHalfCard().copy();
-        ((ModalDoubleFacedCardHalf) leftHalfCard).setParentCard(this);
-        this.rightHalfCard = card.rightHalfCard.copy();
-        ((ModalDoubleFacedCardHalf) rightHalfCard).setParentCard(this);
+        if (card.leftHalfCard != null) {
+            this.leftHalfCard = card.leftHalfCard;
+            ((ModalDoubleFacedCardHalf) this.leftHalfCard).setParentCard(this);
+        }
+        if (card.rightHalfCard != null) {
+            this.rightHalfCard = card.rightHalfCard;
+            ((ModalDoubleFacedCardHalf) this.rightHalfCard).setParentCard(this);
+        }
     }
 
     public ModalDoubleFacedCardHalf getLeftHalfCard() {
diff --git a/Mage/src/main/java/mage/cards/SplitCard.java b/Mage/src/main/java/mage/cards/SplitCard.java
index aafccf957b2..db87315ebb3 100644
--- a/Mage/src/main/java/mage/cards/SplitCard.java
+++ b/Mage/src/main/java/mage/cards/SplitCard.java
@@ -38,10 +38,14 @@ public abstract class SplitCard extends CardImpl implements CardWithHalves {
 
     protected SplitCard(SplitCard card) {
         super(card);
-        this.leftHalfCard = card.getLeftHalfCard().copy();
-        ((SplitCardHalf) leftHalfCard).setParentCard(this);
-        this.rightHalfCard = card.rightHalfCard.copy();
-        ((SplitCardHalf) rightHalfCard).setParentCard(this);
+        if (card.leftHalfCard != null) {
+            this.leftHalfCard = card.leftHalfCard;
+            ((SplitCardHalf) this.leftHalfCard).setParentCard(this);
+        }
+        if (card.rightHalfCard != null) {
+            this.rightHalfCard = card.rightHalfCard;
+            ((SplitCardHalf) this.rightHalfCard).setParentCard(this);
+        }
     }
 
     public void setParts(SplitCardHalf leftHalfCard, SplitCardHalf rightHalfCard) {
diff --git a/Mage/src/main/java/mage/game/ZonesHandler.java b/Mage/src/main/java/mage/game/ZonesHandler.java
index 65d336cdf1a..809fc545a32 100644
--- a/Mage/src/main/java/mage/game/ZonesHandler.java
+++ b/Mage/src/main/java/mage/game/ZonesHandler.java
@@ -16,6 +16,7 @@ import mage.game.permanent.PermanentToken;
 import mage.game.stack.Spell;
 import mage.players.Player;
 import mage.target.TargetCard;
+import mage.util.FuzzyTestsUtil;
 
 import java.util.*;
 
@@ -416,6 +417,9 @@ public final class ZonesHandler {
                             && card.removeFromZone(game, fromZone, source)) {
                         success = true;
                         event.setTarget(permanent);
+
+                        // tests only: inject fuzzy data with random phased out permanents
+                        FuzzyTestsUtil.addRandomPhasedOutPermanent(permanent, source, game);
                     } else {
                         // revert controller to owner if permanent does not enter
                         game.getContinuousEffects().setController(permanent.getId(), permanent.getOwnerId());
diff --git a/Mage/src/main/java/mage/util/FuzzyTestsUtil.java b/Mage/src/main/java/mage/util/FuzzyTestsUtil.java
new file mode 100644
index 00000000000..1523c9040a5
--- /dev/null
+++ b/Mage/src/main/java/mage/util/FuzzyTestsUtil.java
@@ -0,0 +1,90 @@
+package mage.util;
+
+import mage.MageObject;
+import mage.abilities.Ability;
+import mage.abilities.effects.EntersBattlefieldEffect;
+import mage.abilities.keyword.PhasingAbility;
+import mage.cards.Card;
+import mage.constants.SubType;
+import mage.constants.Zone;
+import mage.game.Game;
+import mage.game.permanent.Permanent;
+import mage.players.Player;
+
+import java.util.Map;
+import java.util.UUID;
+
+/**
+ * Helper class for fuzzy testing
+ * <p>
+ * Support:
+ * - [x] enable by command line;
+ * - [x] phased out permanents must be hidden
+ * - [ ] TODO: out of range players and permanents must be hidden
+ * - [ ] TODO: leave/disconnected players must be hidden
+ * <p>
+ * How-to use:
+ * - enable here or by command line
+ * - run unit tests and research the fails
+ *
+ * @author JayDi85
+ */
+public class FuzzyTestsUtil {
+
+    /**
+     * Phased out permanents must be hidden
+     * Make sure other cards and effects do not see phased out permanents and ignore it
+     * <p>
+     * Use case:
+     * - each permanent on battlefield will have copied phased out version with all abilities and effects
+     * <p>
+     * How-to use:
+     * - set true or run with -Dxmage.tests.addRandomPhasedOutPermanents=true
+     */
+    public static boolean ADD_RANDOM_PHASED_OUT_PERMANENTS = false;
+
+    static {
+        String val = System.getProperty("xmage.tests.addRandomPhasedOutPermanents");
+        if (val != null) {
+            ADD_RANDOM_PHASED_OUT_PERMANENTS = Boolean.parseBoolean(val);
+        }
+    }
+
+    /**
+     * Create duplicated phased out permanent
+     */
+    public static void addRandomPhasedOutPermanent(Permanent originalPermanent, Ability source, Game game) {
+        if (!ADD_RANDOM_PHASED_OUT_PERMANENTS) {
+            return;
+        }
+        Player samplePlayer = game.getPlayers().values().stream().findFirst().orElse(null);
+        if (samplePlayer == null || !samplePlayer.isTestsMode()) {
+            return;
+        }
+
+        // copy permanent and put it to battlefield as phased out (diff sides also supported here)
+        // TODO: add phased out tests support (must not fail on it)
+        Card originalCardSide = game.getCard(originalPermanent.getId());
+        Card originalCardMain = originalCardSide.getMainCard();
+        if (!originalCardMain.hasAbility(PhasingAbility.getInstance(), game)) {
+            boolean canCreate = true;
+            Card doppelgangerCardMain = game.copyCard(originalCardMain, source, originalPermanent.getControllerId());
+            Map<UUID, MageObject> mapOldToNew = CardUtil.getOriginalToCopiedPartsMap(originalCardMain, doppelgangerCardMain);
+            Card doppelgangerCardSide = (Card) mapOldToNew.getOrDefault(originalCardSide.getId(), null);
+            doppelgangerCardSide.addAbility(PhasingAbility.getInstance());
+
+            // compatibility workaround: remove all etb abilities to skip any etb choices (e.g. copy effect)
+            doppelgangerCardSide.getAbilities().removeIf(a -> a.getEffects().stream().anyMatch(e -> e instanceof EntersBattlefieldEffect));
+            // compatibility workaround: ignore aura to skip any etb choices (e.g. select new target)
+            if (doppelgangerCardSide.hasSubtype(SubType.AURA, game)) {
+                canCreate = false;
+            }
+
+            if (canCreate) {
+                doppelgangerCardSide.putOntoBattlefield(game, Zone.BATTLEFIELD, source, originalPermanent.getControllerId());
+                Permanent doppelgangerPerm = CardUtil.getPermanentFromCardPutToBattlefield(doppelgangerCardSide, game);
+                doppelgangerPerm.phaseOut(game, true); // use indirect, so no phase in on untap
+            }
+        }
+    }
+}