diff --git a/Mage.Sets/src/mage/cards/k/KateStewart.java b/Mage.Sets/src/mage/cards/k/KateStewart.java
new file mode 100644
index 00000000000..93309859588
--- /dev/null
+++ b/Mage.Sets/src/mage/cards/k/KateStewart.java
@@ -0,0 +1,124 @@
+package mage.cards.k;
+
+import mage.MageInt;
+import mage.abilities.Ability;
+import mage.abilities.TriggeredAbilityImpl;
+import mage.abilities.common.AttacksTriggeredAbility;
+import mage.abilities.costs.mana.GenericManaCost;
+import mage.abilities.dynamicvalue.DynamicValue;
+import mage.abilities.effects.Effect;
+import mage.abilities.effects.common.CreateTokenEffect;
+import mage.abilities.effects.common.DoIfCostPaid;
+import mage.abilities.effects.common.continuous.BoostAllEffect;
+import mage.abilities.hint.Hint;
+import mage.abilities.hint.ValueHint;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.*;
+import mage.counters.CounterType;
+import mage.filter.StaticFilters;
+import mage.game.Game;
+import mage.game.events.GameEvent;
+import mage.game.permanent.token.SoldierToken;
+
+import java.util.UUID;
+
+/**
+ * @author TheElk801
+ */
+public final class KateStewart extends CardImpl {
+
+    public KateStewart(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{1}{U}{R}{W}");
+
+        this.supertype.add(SuperType.LEGENDARY);
+        this.subtype.add(SubType.HUMAN);
+        this.subtype.add(SubType.SCIENTIST);
+        this.power = new MageInt(3);
+        this.toughness = new MageInt(3);
+
+        // Whenever you put one or more time counters on a permanent you control, create a 1/1 white Soldier creature token.
+        this.addAbility(new KateStewartTriggeredAbility());
+
+        // Whenever Kate Stewart attacks, you may pay {8}. If you do, attacking creatures get +X/+X until end of turn, where X is the number of time counters among permanents you control.
+        this.addAbility(new AttacksTriggeredAbility(new DoIfCostPaid(new BoostAllEffect(
+                KateStewartValue.instance, KateStewartValue.instance, Duration.EndOfTurn,
+                StaticFilters.FILTER_ATTACKING_CREATURES, false
+        ), new GenericManaCost(8))).addHint(KateStewartValue.getHint()));
+    }
+
+    private KateStewart(final KateStewart card) {
+        super(card);
+    }
+
+    @Override
+    public KateStewart copy() {
+        return new KateStewart(this);
+    }
+}
+
+class KateStewartTriggeredAbility extends TriggeredAbilityImpl {
+
+    KateStewartTriggeredAbility() {
+        super(Zone.BATTLEFIELD, new CreateTokenEffect(new SoldierToken()));
+        setTriggerPhrase("Whenever you put one or more time counters on a permanent you control, ");
+    }
+
+    private KateStewartTriggeredAbility(final KateStewartTriggeredAbility ability) {
+        super(ability);
+    }
+
+    @Override
+    public KateStewartTriggeredAbility copy() {
+        return new KateStewartTriggeredAbility(this);
+    }
+
+    @Override
+    public boolean checkEventType(GameEvent event, Game game) {
+        return event.getType() == GameEvent.EventType.COUNTERS_ADDED;
+    }
+
+    @Override
+    public boolean checkTrigger(GameEvent event, Game game) {
+        return CounterType.TIME.getName().equals(event.getData())
+                && this.isControlledBy(event.getPlayerId())
+                && this.isControlledBy(game.getControllerId(event.getTargetId()));
+    }
+}
+
+enum KateStewartValue implements DynamicValue {
+    instance;
+    private static final Hint hint = new ValueHint("Time counters among permanents you control", instance);
+
+    public static Hint getHint() {
+        return hint;
+    }
+
+    @Override
+    public int calculate(Game game, Ability sourceAbility, Effect effect) {
+        return game
+                .getBattlefield()
+                .getActivePermanents(
+                        StaticFilters.FILTER_CONTROLLED_PERMANENT,
+                        sourceAbility.getControllerId(), sourceAbility, game
+                ).stream()
+                .map(permanent -> permanent.getCounters(game))
+                .mapToInt(c -> c.getCount(CounterType.TIME))
+                .sum();
+    }
+
+    @Override
+    public KateStewartValue copy() {
+        return this;
+    }
+
+    @Override
+    public String getMessage() {
+        return "the number of time counters among permanents you control";
+    }
+
+    @Override
+    public String toString() {
+        return "X";
+    }
+}
diff --git a/Mage.Sets/src/mage/sets/DoctorWho.java b/Mage.Sets/src/mage/sets/DoctorWho.java
index e8d16815138..24062ade52b 100644
--- a/Mage.Sets/src/mage/sets/DoctorWho.java
+++ b/Mage.Sets/src/mage/sets/DoctorWho.java
@@ -115,6 +115,7 @@ public final class DoctorWho extends ExpansionSet {
         cards.add(new SetCardInfo("Judoon Enforcers", 138, Rarity.UNCOMMON, mage.cards.j.JudoonEnforcers.class));
         cards.add(new SetCardInfo("K-9, Mark I", 47, Rarity.RARE, mage.cards.k.K9MarkI.class));
         cards.add(new SetCardInfo("Karvanista, Loyal Lupari", 106, Rarity.RARE, mage.cards.k.KarvanistaLoyalLupari.class));
+        cards.add(new SetCardInfo("Kate Stewart", 139, Rarity.RARE, mage.cards.k.KateStewart.class));
         cards.add(new SetCardInfo("Laser Screwdriver", 178, Rarity.UNCOMMON, mage.cards.l.LaserScrewdriver.class));
         cards.add(new SetCardInfo("Lavaclaw Reaches", 289, Rarity.RARE, mage.cards.l.LavaclawReaches.class));
         cards.add(new SetCardInfo("Lightning Greaves", 243, Rarity.UNCOMMON, mage.cards.l.LightningGreaves.class));