[CLB] Implemented Descent into Avernus

Mage.Sets/src/mage/cards/d/DescentIntoAvernus.java

@@ -0,0 +1,87 @@
+package mage.cards.d;
+
+import mage.abilities.Ability;
+import mage.abilities.common.BeginningOfUpkeepTriggeredAbility;
+import mage.abilities.dynamicvalue.DynamicValue;
+import mage.abilities.dynamicvalue.common.CountersSourceCount;
+import mage.abilities.effects.OneShotEffect;
+import mage.abilities.effects.common.DamagePlayersEffect;
+import mage.abilities.effects.common.counter.AddCountersSourceEffect;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.constants.Outcome;
+import mage.constants.TargetController;
+import mage.counters.CounterType;
+import mage.game.Game;
+import mage.game.permanent.token.TreasureToken;
+
+import java.util.Objects;
+import java.util.Optional;
+import java.util.UUID;
+
+/**
+ * @author TheElk801
+ */
+public final class DescentIntoAvernus extends CardImpl {
+
+    private static final DynamicValue xValue = new CountersSourceCount(CounterType.DESCENT);
+
+    public DescentIntoAvernus(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.ENCHANTMENT}, "{2}{R}");
+
+        // At the beginning of your upkeep, put two descent counters on Descent into Avernus. Then each player creates X Treasure tokens and Descent into Avernus deals X damage to each player, where X is the number of descent counters on Descent into Avernus.
+        Ability ability = new BeginningOfUpkeepTriggeredAbility(
+                new AddCountersSourceEffect(CounterType.DESCENT.createInstance(2)),
+                TargetController.YOU, false
+        );
+        ability.addEffect(new DescentIntoAvernusEffect());
+        ability.addEffect(new DamagePlayersEffect(
+                Outcome.Damage, xValue, TargetController.ANY
+        ).concatBy("and"));
+        this.addAbility(ability);
+    }
+
+    private DescentIntoAvernus(final DescentIntoAvernus card) {
+        super(card);
+    }
+
+    @Override
+    public DescentIntoAvernus copy() {
+        return new DescentIntoAvernus(this);
+    }
+}
+
+class DescentIntoAvernusEffect extends OneShotEffect {
+
+    DescentIntoAvernusEffect() {
+        super(Outcome.Benefit);
+        staticText = "Then each player creates X Treasure tokens";
+    }
+
+    private DescentIntoAvernusEffect(final DescentIntoAvernusEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public DescentIntoAvernusEffect copy() {
+        return new DescentIntoAvernusEffect(this);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        int count = Optional
+                .of(source.getSourcePermanentOrLKI(game))
+                .filter(Objects::nonNull)
+                .map(permanent -> permanent.getCounters(game))
+                .map(counters -> counters.getCount(CounterType.DESCENT))
+                .orElse(0);
+        if (count < 1) {
+            return false;
+        }
+        for (UUID playerId : game.getState().getPlayersInRange(source.getControllerId(), game)) {
+            new TreasureToken().putOntoBattlefield(count, game, source);
+        }
+        return true;
+    }
+}

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

@@ -158,6 +158,7 @@ public final class CommanderLegendsBattleForBaldursGate extends ExpansionSet {
         cards.add(new SetCardInfo("Deadly Dispute", 124, Rarity.COMMON, mage.cards.d.DeadlyDispute.class));
         cards.add(new SetCardInfo("Decanter of Endless Water", 309, Rarity.COMMON, mage.cards.d.DecanterOfEndlessWater.class));
         cards.add(new SetCardInfo("Demon Bolt", 787, Rarity.COMMON, mage.cards.d.DemonBolt.class));
+        cards.add(new SetCardInfo("Descent into Avernus", 169, Rarity.RARE, mage.cards.d.DescentIntoAvernus.class));
         cards.add(new SetCardInfo("Desolate Lighthouse", 890, Rarity.RARE, mage.cards.d.DesolateLighthouse.class));
         cards.add(new SetCardInfo("Despark", 841, Rarity.UNCOMMON, mage.cards.d.Despark.class));
         cards.add(new SetCardInfo("Dimir Aqueduct", 891, Rarity.UNCOMMON, mage.cards.d.DimirAqueduct.class));

Mage/src/main/java/mage/counters/CounterType.java

@@ -44,6 +44,7 @@ public enum CounterType {
     DEATHTOUCH("deathtouch"),
     DELAY("delay"),
     DEPLETION("depletion"),
+    DESCENT("descent"),
     DESPAIR("despair"),
     DEVOTION("devotion"),
     DIVINITY("divinity"),