[LCI] Implement The Millennium Calendar (#11359)

new UNTAPPED_BATCH event.

Mage/src/main/java/mage/game/events/UntappedBatchEvent.java

@@ -0,0 +1,56 @@
+package mage.game.events;
+
+import java.util.HashSet;
+import java.util.Objects;
+import java.util.Set;
+import java.util.UUID;
+import java.util.stream.Collectors;
+
+/**
+ * @author Susucr
+ */
+public class UntappedBatchEvent extends GameEvent implements BatchGameEvent<UntappedEvent> {
+
+    private final Set<UntappedEvent> events = new HashSet<>();
+
+    public UntappedBatchEvent() {
+        super(EventType.UNTAPPED_BATCH, null, null, null);
+    }
+
+    @Override
+    public Set<UntappedEvent> getEvents() {
+        return events;
+    }
+
+    @Override
+    public Set<UUID> getTargets() {
+        return events.stream()
+                .map(GameEvent::getTargetId)
+                .filter(Objects::nonNull)
+                .collect(Collectors.toSet());
+    }
+
+    @Override
+    public int getAmount() {
+        return events
+                .stream()
+                .mapToInt(GameEvent::getAmount)
+                .sum();
+    }
+
+    @Override
+    @Deprecated // events can store a diff value, so search it from events list instead
+    public UUID getTargetId() {
+        throw new IllegalStateException("Wrong code usage. Must search value from a getEvents list or use CardUtil.getEventTargets(event)");
+    }
+
+    @Override
+    @Deprecated // events can store a diff value, so search it from events list instead
+    public UUID getSourceId() {
+        throw new IllegalStateException("Wrong code usage. Must search value from a getEvents list.");
+    }
+
+    public void addEvent(UntappedEvent event) {
+        this.events.add(event);
+    }
+}