[LCI] Implement Subterranean Schooner

Mage/src/main/java/mage/filter/predicate/permanent/CrewedSourceThisTurnPredicate.java

@@ -0,0 +1,26 @@
+package mage.filter.predicate.permanent;
+
+import mage.filter.predicate.ObjectSourcePlayer;
+import mage.filter.predicate.ObjectSourcePlayerPredicate;
+import mage.game.Game;
+import mage.game.permanent.Permanent;
+import mage.watchers.common.CrewedVehicleWatcher;
+
+/**
+ * @author TheElk801
+ */
+public enum CrewedSourceThisTurnPredicate implements ObjectSourcePlayerPredicate<Permanent> {
+    instance;
+
+    @Override
+    public boolean apply(ObjectSourcePlayer<Permanent> input, Game game) {
+        return CrewedVehicleWatcher.checkIfCrewedThisTurn(
+                input.getObject(), input.getSource().getSourcePermanentOrLKI(game), game
+        );
+    }
+
+    @Override
+    public String toString() {
+        return "crewed {this} this turn";
+    }
+}

Mage/src/main/java/mage/watchers/common/CrewedVehicleWatcher.java

@@ -0,0 +1,46 @@
+package mage.watchers.common;
+
+import mage.MageObjectReference;
+import mage.constants.WatcherScope;
+import mage.game.Game;
+import mage.game.events.GameEvent;
+import mage.game.permanent.Permanent;
+import mage.watchers.Watcher;
+
+import java.util.*;
+
+/**
+ * @author TheElk801
+ */
+public class CrewedVehicleWatcher extends Watcher {
+
+    private final Map<MageObjectReference, Set<MageObjectReference>> crewMap = new HashMap<>();
+
+    public CrewedVehicleWatcher() {
+        super(WatcherScope.GAME);
+    }
+
+    @Override
+    public void watch(GameEvent event, Game game) {
+        if (event.getType() == GameEvent.EventType.CREWED_VEHICLE) {
+            crewMap.computeIfAbsent(new MageObjectReference(event.getSourceId(), game), x -> new HashSet<>())
+                    .add(new MageObjectReference(event.getTargetId(), game));
+        }
+    }
+
+    @Override
+    public void reset() {
+        super.reset();
+        crewMap.clear();
+    }
+
+    public static boolean checkIfCrewedThisTurn(Permanent crewer, Permanent crewed, Game game) {
+        return game
+                .getState()
+                .getWatcher(CrewedVehicleWatcher.class)
+                .crewMap
+                .getOrDefault(new MageObjectReference(crewed, game), Collections.emptySet())
+                .stream()
+                .anyMatch(mor -> mor.refersTo(crewer, game));
+    }
+}