Implemented Whirlwind Denial

Mage.Sets/src/mage/cards/w/WhirlwindDenial.java

@@ -0,0 +1,78 @@
+package mage.cards.w;
+
+import mage.abilities.Ability;
+import mage.abilities.costs.Cost;
+import mage.abilities.costs.mana.GenericManaCost;
+import mage.abilities.effects.OneShotEffect;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.constants.Outcome;
+import mage.game.Game;
+import mage.players.Player;
+
+import java.util.Objects;
+import java.util.UUID;
+
+/**
+ * @author TheElk801
+ */
+public final class WhirlwindDenial extends CardImpl {
+
+    public WhirlwindDenial(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.INSTANT}, "{2}{U}");
+
+        // For each spell and ability your opponents control, counter it unless its controller pays {4}.
+        this.getSpellAbility().addEffect(new WhirlwindDenialEffect());
+    }
+
+    private WhirlwindDenial(final WhirlwindDenial card) {
+        super(card);
+    }
+
+    @Override
+    public WhirlwindDenial copy() {
+        return new WhirlwindDenial(this);
+    }
+}
+
+class WhirlwindDenialEffect extends OneShotEffect {
+
+    WhirlwindDenialEffect() {
+        super(Outcome.Benefit);
+        staticText = "For each spell and ability your opponents control, " +
+                "counter it unless its controller pays {4}.";
+    }
+
+    private WhirlwindDenialEffect(final WhirlwindDenialEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public WhirlwindDenialEffect copy() {
+        return new WhirlwindDenialEffect(this);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        game.getStack()
+                .stream()
+                .filter(Objects::nonNull)
+                .forEachOrdered(stackObject -> {
+                    if (!game.getOpponents(stackObject.getControllerId()).contains(source.getControllerId())) {
+                        return;
+                    }
+                    Player player = game.getPlayer(stackObject.getControllerId());
+                    if (player == null) {
+                        return;
+                    }
+                    Cost cost = new GenericManaCost(4);
+                    if (player.chooseUse(outcome, "Pay {4} to prevent " + stackObject.getIdName() + " from being countered?", source, game)
+                            && cost.pay(source, game, source.getSourceId(), source.getControllerId(), false)) {
+                        return;
+                    }
+                    stackObject.counter(source.getSourceId(), game);
+                });
+        return true;
+    }
+}

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

@@ -165,6 +165,7 @@ public final class TherosBeyondDeath extends ExpansionSet {
         cards.add(new SetCardInfo("Victory's Envoy", 289, Rarity.RARE, mage.cards.v.VictorysEnvoy.class));
         cards.add(new SetCardInfo("Warden of the Chained", 230, Rarity.UNCOMMON, mage.cards.w.WardenOfTheChained.class));
         cards.add(new SetCardInfo("Wavebreak Hippocamp", 80, Rarity.RARE, mage.cards.w.WavebreakHippocamp.class));
+        cards.add(new SetCardInfo("Whirlwind Denial", 81, Rarity.UNCOMMON, mage.cards.w.WhirlwindDenial.class));
         cards.add(new SetCardInfo("Woe Strider", 123, Rarity.RARE, mage.cards.w.WoeStrider.class));
     }
 }