diff --git a/Mage.Sets/src/mage/cards/t/TeferiMasterOfTime.java b/Mage.Sets/src/mage/cards/t/TeferiMasterOfTime.java
new file mode 100644
index 0000000000..3ba2279cb2
--- /dev/null
+++ b/Mage.Sets/src/mage/cards/t/TeferiMasterOfTime.java
@@ -0,0 +1,115 @@
+package mage.cards.t;
+
+import mage.abilities.Ability;
+import mage.abilities.LoyaltyAbility;
+import mage.abilities.common.PlaneswalkerEntersWithLoyaltyCountersAbility;
+import mage.abilities.common.SimpleStaticAbility;
+import mage.abilities.effects.AsThoughEffectImpl;
+import mage.abilities.effects.OneShotEffect;
+import mage.abilities.effects.common.DrawDiscardControllerEffect;
+import mage.abilities.effects.common.PhaseOutTargetEffect;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.*;
+import mage.filter.StaticFilters;
+import mage.game.Game;
+import mage.game.turn.TurnMod;
+import mage.target.TargetPermanent;
+
+import java.util.UUID;
+
+/**
+ * @author TheElk801
+ */
+public final class TeferiMasterOfTime extends CardImpl {
+
+    public TeferiMasterOfTime(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.PLANESWALKER}, "{2}{U}{U}");
+
+        this.addSuperType(SuperType.LEGENDARY);
+        this.subtype.add(SubType.TEFERI);
+        this.addAbility(new PlaneswalkerEntersWithLoyaltyCountersAbility(3));
+
+        // You may activate loyalty abilities of Teferi, Master of Time on any player's turn any time you could cast an instant.
+        this.addAbility(new SimpleStaticAbility(new TeferiMasterOfTimeActivationEffect()));
+
+        // +1: Draw a card, then discard a card.
+        this.addAbility(new LoyaltyAbility(new DrawDiscardControllerEffect(1, 1), 1));
+
+        // −3: Target creature you don't control phases out.
+        Ability ability = new LoyaltyAbility(new PhaseOutTargetEffect(), -3);
+        ability.addTarget(new TargetPermanent(StaticFilters.FILTER_CREATURE_YOU_DONT_CONTROL));
+        this.addAbility(ability);
+
+        // −10: Take two extra turns after this one.
+        this.addAbility(new LoyaltyAbility(new TeferiMasterOfTimeTurnEffect(), -10));
+    }
+
+    private TeferiMasterOfTime(final TeferiMasterOfTime card) {
+        super(card);
+    }
+
+    @Override
+    public TeferiMasterOfTime copy() {
+        return new TeferiMasterOfTime(this);
+    }
+}
+
+class TeferiMasterOfTimeActivationEffect extends AsThoughEffectImpl {
+
+    TeferiMasterOfTimeActivationEffect() {
+        super(AsThoughEffectType.ACTIVATE_AS_INSTANT, Duration.EndOfGame, Outcome.Benefit);
+        staticText = "You may activate loyalty abilities of {this} " +
+                "on any player's turn any time you could cast an instant";
+    }
+
+    private TeferiMasterOfTimeActivationEffect(final TeferiMasterOfTimeActivationEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        return true;
+    }
+
+    @Override
+    public TeferiMasterOfTimeActivationEffect copy() {
+        return new TeferiMasterOfTimeActivationEffect(this);
+    }
+
+    @Override
+    public boolean applies(UUID objectId, Ability affectedAbility, Ability source, Game game, UUID playerId) {
+        return affectedAbility.isControlledBy(source.getControllerId())
+                && affectedAbility.getSourceId().equals(source.getSourceId())
+                && affectedAbility instanceof LoyaltyAbility;
+    }
+
+    @Override
+    public boolean applies(UUID objectId, Ability source, UUID affectedControllerId, Game game) {
+        return false;
+    }
+}
+
+class TeferiMasterOfTimeTurnEffect extends OneShotEffect {
+
+    TeferiMasterOfTimeTurnEffect() {
+        super(Outcome.ExtraTurn);
+        staticText = "take two extra turns after this one";
+    }
+
+    private TeferiMasterOfTimeTurnEffect(final TeferiMasterOfTimeTurnEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public TeferiMasterOfTimeTurnEffect copy() {
+        return new TeferiMasterOfTimeTurnEffect(this);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        game.getState().getTurnMods().add(new TurnMod(source.getControllerId(), false));
+        game.getState().getTurnMods().add(new TurnMod(source.getControllerId(), false));
+        return true;
+    }
+}
diff --git a/Mage.Sets/src/mage/sets/CoreSet2021.java b/Mage.Sets/src/mage/sets/CoreSet2021.java
index d0cb77d645..4fb8189e24 100644
--- a/Mage.Sets/src/mage/sets/CoreSet2021.java
+++ b/Mage.Sets/src/mage/sets/CoreSet2021.java
@@ -56,6 +56,7 @@ public final class CoreSet2021 extends ExpansionSet {
         cards.add(new SetCardInfo("Spirit of Malevolence", 331, Rarity.COMMON, mage.cards.s.SpiritOfMalevolence.class));
         cards.add(new SetCardInfo("Storm Caller", 335, Rarity.COMMON, mage.cards.s.StormCaller.class));
         cards.add(new SetCardInfo("Teferi's Protege", 77, Rarity.COMMON, mage.cards.t.TeferisProtege.class));
+        cards.add(new SetCardInfo("Teferi, Master of Time", 75, Rarity.MYTHIC, mage.cards.t.TeferiMasterOfTime.class));
         cards.add(new SetCardInfo("Tormod's Crypt", 241, Rarity.UNCOMMON, mage.cards.t.TormodsCrypt.class));
         cards.add(new SetCardInfo("Ugin, the Spirit Dragon", 1, Rarity.MYTHIC, mage.cards.u.UginTheSpiritDragon.class));
         cards.add(new SetCardInfo("Vito, Thorn of the Dusk Rose", 127, Rarity.RARE, mage.cards.v.VitoThornOfTheDuskRose.class));