Implemented Unleash Fury

Mage.Sets/src/mage/cards/u/UnleashFury.java

@@ -0,0 +1,67 @@
+package mage.cards.u;
+
+import mage.abilities.Ability;
+import mage.abilities.effects.OneShotEffect;
+import mage.abilities.effects.common.continuous.BoostTargetEffect;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.constants.Duration;
+import mage.constants.Outcome;
+import mage.game.Game;
+import mage.game.permanent.Permanent;
+import mage.target.common.TargetCreaturePermanent;
+
+import java.util.UUID;
+
+/**
+ * @author TheElk801
+ */
+public final class UnleashFury extends CardImpl {
+
+    public UnleashFury(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.INSTANT}, "{1}{R}");
+
+        // Double the power of target creature until end of turn.
+        this.getSpellAbility().addEffect(new UnleashFuryEffect());
+        this.getSpellAbility().addTarget(new TargetCreaturePermanent());
+    }
+
+    private UnleashFury(final UnleashFury card) {
+        super(card);
+    }
+
+    @Override
+    public UnleashFury copy() {
+        return new UnleashFury(this);
+    }
+}
+
+class UnleashFuryEffect extends OneShotEffect {
+
+    UnleashFuryEffect() {
+        super(Outcome.Benefit);
+        staticText = "double the power of target creature until end of turn";
+    }
+
+    private UnleashFuryEffect(final UnleashFuryEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public UnleashFuryEffect copy() {
+        return new UnleashFuryEffect(this);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        Permanent permanent = game.getPermanent(source.getFirstTarget());
+        if (permanent == null) {
+            return false;
+        }
+        game.addEffect(new BoostTargetEffect(
+                2 * permanent.getPower().getValue(), 0, Duration.EndOfTurn
+        ), source);
+        return true;
+    }
+}

Mage.Sets/src/mage/sets/CoreSet2021.java

@@ -193,6 +193,7 @@ public final class CoreSet2021 extends ExpansionSet {
         cards.add(new SetCardInfo("Traitorous Greed", 166, Rarity.UNCOMMON, mage.cards.t.TraitorousGreed.class));
         cards.add(new SetCardInfo("Trufflesnout", 212, Rarity.COMMON, mage.cards.t.Trufflesnout.class));
         cards.add(new SetCardInfo("Ugin, the Spirit Dragon", 1, Rarity.MYTHIC, mage.cards.u.UginTheSpiritDragon.class));
+        cards.add(new SetCardInfo("Unleash Fury", 170, Rarity.UNCOMMON, mage.cards.u.UnleashFury.class));
         cards.add(new SetCardInfo("Unsubstantiate", 82, Rarity.UNCOMMON, mage.cards.u.Unsubstantiate.class));
         cards.add(new SetCardInfo("Valorous Steed", 42, Rarity.COMMON, mage.cards.v.ValorousSteed.class));
         cards.add(new SetCardInfo("Village Rites", 126, Rarity.COMMON, mage.cards.v.VillageRites.class));

Utils/mtg-cards-data.txt

@@ -37548,6 +37548,7 @@ Subira, Tulzidi Caravanner|Core Set 2021|162|R|{2}{R}|Legendary Creature - Human
 Terror of the Peaks|Core Set 2021|164|M|{3}{R}{R}|Creature - Dragon|5|4|Flying$Spells your opponents cast that target Terror of the Peaks cost an additional 3 life to cast.$Whenever another creature enters the battlefield under your control, Terror of the Peaks deals damage equal to that creature's power to any taret.|
 Traitorous Greed|Core Set 2021|166|U|{3}{R}|Sorcery|||Gain control of target creature until end of turn. Untap that creature. It gains haste until end of turn. Add two mana of any one color.|
 Transmogrify|Core Set 2021|167|R|{3}{R}|Sorcery|||Exile target creature. That creature's controller reveals cards from the top of their library until they reveal a creature card. That player puts that card onto the battlefield, then shuffles the rest into their library.|
+Unleash Fury|Core Set 2021|170|U|{1}{R}|Instant|||Double the power of target creature until end of turn.|
 Volcanic Geyser|Core Set 2021|171|U|{X}{R}{R}|Instant|||Volcanic Geyser deals X damage to any target.|
 Volcanic Salvo|Core Set 2021|172|R|{10}{R}{R}|Sorcery|||This spell costs {X} less to cast, where X is the total power of creatures you control.$Volcanic Salvo deals 6 damage to each of up to two target creatures and/or planeswalkers.|
 Azusa, Lost but Seeking|Core Set 2021|173|R|{2}{G}|Legendary Creature - Human Monk|1|2|You may play two additional lands on each of your turns.|