diff --git a/Mage.Sets/src/mage/cards/m/MairsilThePretender.java b/Mage.Sets/src/mage/cards/m/MairsilThePretender.java
new file mode 100644
index 0000000000..74d3bb2e99
--- /dev/null
+++ b/Mage.Sets/src/mage/cards/m/MairsilThePretender.java
@@ -0,0 +1,185 @@
+/*
+ *  Copyright 2010 BetaSteward_at_googlemail.com. All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without modification, are
+ *  permitted provided that the following conditions are met:
+ *
+ *     1. Redistributions of source code must retain the above copyright notice, this list of
+ *        conditions and the following disclaimer.
+ *
+ *     2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *        of conditions and the following disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY BetaSteward_at_googlemail.com ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ *  FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BetaSteward_at_googlemail.com OR
+ *  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ *  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ *  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ *  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *  The views and conclusions contained in the software and documentation are those of the
+ *  authors and should not be interpreted as representing official policies, either expressed
+ *  or implied, of BetaSteward_at_googlemail.com.
+ */
+package mage.cards.m;
+
+import java.util.UUID;
+import mage.MageInt;
+import mage.abilities.Ability;
+import mage.abilities.ActivatedAbility;
+import mage.abilities.common.EntersBattlefieldTriggeredAbility;
+import mage.abilities.common.LimitedTimesPerTurnActivatedAbility;
+import mage.abilities.common.SimpleStaticAbility;
+import mage.abilities.effects.ContinuousEffectImpl;
+import mage.abilities.effects.OneShotEffect;
+import mage.cards.Card;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.constants.Duration;
+import mage.constants.Layer;
+import mage.constants.Outcome;
+import mage.constants.SubLayer;
+import mage.constants.SuperType;
+import mage.constants.TargetController;
+import mage.constants.Zone;
+import mage.counters.CounterType;
+import mage.filter.FilterCard;
+import mage.filter.predicate.Predicates;
+import mage.filter.predicate.mageobject.CardTypePredicate;
+import mage.filter.predicate.other.CounterCardPredicate;
+import mage.filter.predicate.other.OwnerPredicate;
+import mage.game.Game;
+import mage.game.permanent.Permanent;
+import mage.players.Player;
+import mage.target.Target;
+import mage.target.common.TargetCardInHand;
+import mage.target.common.TargetCardInYourGraveyard;
+
+/**
+ *
+ * @author TheElk801
+ */
+public class MairsilThePretender extends CardImpl {
+
+    public MairsilThePretender(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{1}{U}{B}{R}");
+
+        addSuperType(SuperType.LEGENDARY);
+        this.subtype.add("Human");
+        this.subtype.add("Wizard");
+        this.power = new MageInt(4);
+        this.toughness = new MageInt(4);
+
+        // When Mairsil, the Pretender enters the battlefield, you may exile an artifact or creature card from your hand or graveyard and put a cage counter on it.
+        this.addAbility(new EntersBattlefieldTriggeredAbility(new MairsilThePretenderExileEffect(), true));
+
+        // Mairsil, the Pretender has all activated abilities of all cards you own in exile with cage counters on them. You may activate each of those abilities only once each turn.
+        this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, new MairsilThePretenderGainAbilitiesEffect()));
+    }
+
+    public MairsilThePretender(final MairsilThePretender card) {
+        super(card);
+    }
+
+    @Override
+    public MairsilThePretender copy() {
+        return new MairsilThePretender(this);
+    }
+}
+
+class MairsilThePretenderExileEffect extends OneShotEffect {
+
+    private static final FilterCard filter = new FilterCard();
+
+    static {
+        filter.add(Predicates.or(new CardTypePredicate(CardType.ARTIFACT), new CardTypePredicate(CardType.CREATURE)));
+    }
+
+    MairsilThePretenderExileEffect() {
+        super(Outcome.Benefit);
+        this.staticText = "";
+    }
+
+    MairsilThePretenderExileEffect(final MairsilThePretenderExileEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public MairsilThePretenderExileEffect copy() {
+        return new MairsilThePretenderExileEffect(this);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        Player controller = game.getPlayer(source.getControllerId());
+        if (controller != null) {
+            if (controller.chooseUse(Outcome.PutCardInPlay, "Exile a card from your hand? (No = from graveyard)", source, game)) {
+                Target target = new TargetCardInHand(0, 1, filter);
+                controller.choose(outcome, target, source.getSourceId(), game);
+                Card card = controller.getHand().get(target.getFirstTarget(), game);
+                if (card != null) {
+                    controller.moveCards(card, Zone.EXILED, source, game);
+                    card.addCounters(CounterType.CAGE.createInstance(), source, game);
+                }
+            } else {
+                Target target = new TargetCardInYourGraveyard(0, 1, filter);
+                target.choose(Outcome.PutCardInPlay, source.getControllerId(), source.getSourceId(), game);
+                Card card = controller.getGraveyard().get(target.getFirstTarget(), game);
+                if (card != null) {
+                    controller.moveCards(card, Zone.EXILED, source, game);
+                    card.addCounters(CounterType.CAGE.createInstance(), source, game);
+                }
+            }
+            return true;
+        }
+        return false;
+    }
+}
+
+class MairsilThePretenderGainAbilitiesEffect extends ContinuousEffectImpl {
+
+    private static final FilterCard filter = new FilterCard();
+
+    static {
+        filter.add(new CounterCardPredicate(CounterType.CAGE));
+        filter.add(new OwnerPredicate(TargetController.YOU));
+    }
+
+    public MairsilThePretenderGainAbilitiesEffect() {
+        super(Duration.WhileOnBattlefield, Layer.AbilityAddingRemovingEffects_6, SubLayer.NA, Outcome.AddAbility);
+        staticText = "{this} has all activated abilities of all cards you own in exile with cage counters on them. You may activate each of those abilities only once each turn";
+    }
+
+    public MairsilThePretenderGainAbilitiesEffect(final MairsilThePretenderGainAbilitiesEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        Permanent perm = game.getPermanent(source.getSourceId());
+        if (perm != null) {
+            for (Card card : game.getExile().getAllCards(game)) {
+                if (filter.match(card, game)) {
+                    for (Ability ability : card.getAbilities()) {
+                        if (ability instanceof ActivatedAbility) {
+                            ActivatedAbility copyAbility = (ActivatedAbility) ability.copy();
+                            perm.addAbility(copyAbility, card.getId(), game);
+                        }
+                    }
+                }
+            }
+            return true;
+        }
+        return false;
+    }
+
+    @Override
+    public MairsilThePretenderGainAbilitiesEffect copy() {
+        return new MairsilThePretenderGainAbilitiesEffect(this);
+    }
+}
diff --git a/Mage.Sets/src/mage/sets/Commander2017.java b/Mage.Sets/src/mage/sets/Commander2017.java
index 65065e1549..0355adfaf9 100644
--- a/Mage.Sets/src/mage/sets/Commander2017.java
+++ b/Mage.Sets/src/mage/sets/Commander2017.java
@@ -79,6 +79,7 @@ public class Commander2017 extends ExpansionSet {
         cards.add(new SetCardInfo("Kindred Summons", 32, Rarity.RARE, mage.cards.k.KindredSummons.class));
         cards.add(new SetCardInfo("Licia, Sanguine Tribune", 40, Rarity.MYTHIC, mage.cards.l.LiciaSanguineTribune.class));
         cards.add(new SetCardInfo("Magus of the Mind", 12, Rarity.RARE, mage.cards.m.MagusOfTheMind.class));
+        cards.add(new SetCardInfo("Mairsil, the Pretender", 41, Rarity.MYTHIC, mage.cards.m.MairsilThePretender.class));
         cards.add(new SetCardInfo("Mathas, Fiend Seeker", 42, Rarity.MYTHIC, mage.cards.m.MathasFiendSeeker.class));
         cards.add(new SetCardInfo("Mirri, Weatherlight Duelist", 43, Rarity.MYTHIC, mage.cards.m.MirriWeatherlightDuelist.class));
         cards.add(new SetCardInfo("Mirror of the Forebears", 54, Rarity.UNCOMMON, mage.cards.m.MirrorOfTheForebears.class));
diff --git a/Mage/src/main/java/mage/counters/CounterType.java b/Mage/src/main/java/mage/counters/CounterType.java
index 24fcd178b2..18ad68d08b 100644
--- a/Mage/src/main/java/mage/counters/CounterType.java
+++ b/Mage/src/main/java/mage/counters/CounterType.java
@@ -42,6 +42,7 @@ public enum CounterType {
     BOUNTY("bounty"),
     BRIBERY("bribery"),
     BRICK("brick"),
+    CAGE("cage"),
     CARRION("carrion"),
     CHARGE("charge"),
     CORPSE("corpse"),