partial fix for Syrix, Carrier of the Flame

closes #10057, related to #10550

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

@@ -0,0 +1,56 @@
+package mage.watchers.common;
+
+import mage.cards.Card;
+import mage.constants.WatcherScope;
+import mage.constants.Zone;
+import mage.game.Game;
+import mage.game.events.GameEvent;
+import mage.game.events.ZoneChangeEvent;
+import mage.watchers.Watcher;
+
+import java.util.*;
+import java.util.stream.Collectors;
+
+/**
+ * Keeps track of the UUIDs of the cards that left graveyard this turn.
+ */
+public class CardsLeftGraveyardWatcher extends Watcher {
+
+    // Player id -> card ids
+    private final Map<UUID, Set<UUID>> cardsLeftGraveyardThisTurn = new HashMap<>();
+
+    public CardsLeftGraveyardWatcher() {
+        super(WatcherScope.GAME);
+    }
+
+    @Override
+    public void watch(GameEvent event, Game game) {
+        if (event.getType() != GameEvent.EventType.ZONE_CHANGE
+                || ((ZoneChangeEvent) event).getFromZone() != Zone.GRAVEYARD) {
+            return;
+        }
+        UUID playerId = event.getPlayerId();
+        if (playerId == null || game.getCard(event.getTargetId()) == null) {
+            return;
+        }
+        cardsLeftGraveyardThisTurn.computeIfAbsent(playerId, k -> new HashSet<>())
+                        .add(event.getTargetId());
+    }
+
+    /**
+     * The cards that left a specific player's graveyard this turn.
+     */
+    public Set<Card> getCardsThatLeftGraveyard(UUID playerId, Game game) {
+        return cardsLeftGraveyardThisTurn.getOrDefault(playerId, Collections.emptySet())
+                .stream()
+                .map(game::getCard)
+                .filter(Objects::nonNull)
+                .collect(Collectors.toSet());
+    }
+
+    @Override
+    public void reset() {
+        super.reset();
+        cardsLeftGraveyardThisTurn.clear();
+    }
+}