diff --git a/Mage.Sets/src/mage/cards/r/RowdyResearch.java b/Mage.Sets/src/mage/cards/r/RowdyResearch.java
new file mode 100644
index 00000000000..47e4a4c644a
--- /dev/null
+++ b/Mage.Sets/src/mage/cards/r/RowdyResearch.java
@@ -0,0 +1,41 @@
+package mage.cards.r;
+
+import mage.abilities.common.SimpleStaticAbility;
+import mage.abilities.dynamicvalue.common.CreaturesThatAttackedThisTurnCount;
+import mage.abilities.effects.common.DrawCardSourceControllerEffect;
+import mage.abilities.effects.common.cost.SpellCostReductionSourceEffect;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.constants.Zone;
+
+import java.util.UUID;
+
+/**
+ *
+ * @author Susucr
+ */
+public final class RowdyResearch extends CardImpl {
+
+    public RowdyResearch(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.INSTANT}, "{6}{U}");
+        
+        // This spell costs {1} less to cast for each creature that attacked this turn.
+        this.addAbility(new SimpleStaticAbility(
+                Zone.ALL, new SpellCostReductionSourceEffect(CreaturesThatAttackedThisTurnCount.instance)
+                .setText("this spell costs {1} less to cast for each creature that attacked this turn")
+        ).addHint(CreaturesThatAttackedThisTurnCount.instance.getHint()).setRuleAtTheTop(true));
+
+        // Draw three cards.
+        this.getSpellAbility().addEffect(new DrawCardSourceControllerEffect(3));
+    }
+
+    private RowdyResearch(final RowdyResearch card) {
+        super(card);
+    }
+
+    @Override
+    public RowdyResearch copy() {
+        return new RowdyResearch(this);
+    }
+}
diff --git a/Mage.Sets/src/mage/cards/w/WitchstalkerFrenzy.java b/Mage.Sets/src/mage/cards/w/WitchstalkerFrenzy.java
new file mode 100644
index 00000000000..9bb47fcbeef
--- /dev/null
+++ b/Mage.Sets/src/mage/cards/w/WitchstalkerFrenzy.java
@@ -0,0 +1,43 @@
+package mage.cards.w;
+
+import mage.abilities.common.SimpleStaticAbility;
+import mage.abilities.dynamicvalue.common.CreaturesThatAttackedThisTurnCount;
+import mage.abilities.effects.common.DamageTargetEffect;
+import mage.abilities.effects.common.cost.SpellCostReductionSourceEffect;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.constants.Zone;
+import mage.target.common.TargetCreaturePermanent;
+
+import java.util.UUID;
+
+/**
+ *
+ * @author Susucr
+ */
+public final class WitchstalkerFrenzy extends CardImpl {
+
+    public WitchstalkerFrenzy(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.INSTANT}, "{3}{R}");
+        
+        // This spell costs {1} less to cast for each creature that attacked this turn.
+        this.addAbility(new SimpleStaticAbility(
+                Zone.ALL, new SpellCostReductionSourceEffect(CreaturesThatAttackedThisTurnCount.instance)
+                .setText("this spell costs {1} less to cast for each creature that attacked this turn")
+        ).addHint(CreaturesThatAttackedThisTurnCount.instance.getHint()).setRuleAtTheTop(true));
+
+        // Witchstalker Frenzy deals 5 damage to target creature.
+        this.getSpellAbility().addEffect(new DamageTargetEffect(5));
+        this.getSpellAbility().addTarget(new TargetCreaturePermanent());
+    }
+
+    private WitchstalkerFrenzy(final WitchstalkerFrenzy card) {
+        super(card);
+    }
+
+    @Override
+    public WitchstalkerFrenzy copy() {
+        return new WitchstalkerFrenzy(this);
+    }
+}
diff --git a/Mage.Sets/src/mage/sets/WildsOfEldraine.java b/Mage.Sets/src/mage/sets/WildsOfEldraine.java
index 2748cd71eda..e0abf35823a 100644
--- a/Mage.Sets/src/mage/sets/WildsOfEldraine.java
+++ b/Mage.Sets/src/mage/sets/WildsOfEldraine.java
@@ -147,6 +147,7 @@ public final class WildsOfEldraine extends ExpansionSet {
         cards.add(new SetCardInfo("Rotisserie Elemental", 148, Rarity.RARE, mage.cards.r.RotisserieElemental.class));
         cards.add(new SetCardInfo("Rowan's Grim Search", 104, Rarity.COMMON, mage.cards.r.RowansGrimSearch.class));
         cards.add(new SetCardInfo("Rowan, Scion of War", 211, Rarity.MYTHIC, mage.cards.r.RowanScionOfWar.class));
+        cards.add(new SetCardInfo("Rowdy Research", 312, Rarity.UNCOMMON, mage.cards.r.RowdyResearch.class));
         cards.add(new SetCardInfo("Royal Treatment", 183, Rarity.UNCOMMON, mage.cards.r.RoyalTreatment.class));
         cards.add(new SetCardInfo("Ruby, Daring Tracker", 212, Rarity.UNCOMMON, mage.cards.r.RubyDaringTracker.class));
         cards.add(new SetCardInfo("Scalding Viper", 235, Rarity.RARE, mage.cards.s.ScaldingViper.class));
@@ -208,6 +209,7 @@ public final class WildsOfEldraine extends ExpansionSet {
         cards.add(new SetCardInfo("Welcome to Sweettooth", 198, Rarity.UNCOMMON, mage.cards.w.WelcomeToSweettooth.class));
         cards.add(new SetCardInfo("Werefox Bodyguard", 39, Rarity.RARE, mage.cards.w.WerefoxBodyguard.class));
         cards.add(new SetCardInfo("Will, Scion of Peace", 218, Rarity.MYTHIC, mage.cards.w.WillScionOfPeace.class));
+        cards.add(new SetCardInfo("Witchstalker Frenzy", 159, Rarity.UNCOMMON, mage.cards.w.WitchstalkerFrenzy.class));
         cards.add(new SetCardInfo("Woodland Acolyte", 241, Rarity.UNCOMMON, mage.cards.w.WoodlandAcolyte.class));
     }
 
diff --git a/Mage/src/main/java/mage/abilities/dynamicvalue/common/CreaturesThatAttackedThisTurnCount.java b/Mage/src/main/java/mage/abilities/dynamicvalue/common/CreaturesThatAttackedThisTurnCount.java
new file mode 100644
index 00000000000..0030bc6f6dc
--- /dev/null
+++ b/Mage/src/main/java/mage/abilities/dynamicvalue/common/CreaturesThatAttackedThisTurnCount.java
@@ -0,0 +1,40 @@
+package mage.abilities.dynamicvalue.common;
+
+import mage.abilities.Ability;
+import mage.abilities.dynamicvalue.DynamicValue;
+import mage.abilities.effects.Effect;
+import mage.abilities.hint.Hint;
+import mage.abilities.hint.ValueHint;
+import mage.game.Game;
+import mage.watchers.common.AttackedThisTurnWatcher;
+
+/**
+ * @author Susucr
+ */
+public enum CreaturesThatAttackedThisTurnCount implements DynamicValue {
+    instance;
+
+    private static final Hint hint = new ValueHint("Creatures that attacked this turn", instance);
+
+    @Override
+    public int calculate(Game game, Ability sourceAbility, Effect effect) {
+        AttackedThisTurnWatcher watcher = game.getState()
+                .getWatcher(AttackedThisTurnWatcher.class);
+
+        return watcher == null ? 0 : watcher.getAttackedThisTurnCreatures().size();
+    }
+
+    @Override
+    public DynamicValue copy() {
+        return instance;
+    }
+
+    @Override
+    public String getMessage() {
+        return "creatures that attacked this turn";
+    }
+
+    public static Hint getHint() {
+        return hint;
+    }
+}