[MH2] Implemented Recalibrate

Mage/src/main/java/mage/abilities/condition/common/ControllerDiscardedThisTurnCondition.java

@@ -0,0 +1,18 @@
+package mage.abilities.condition.common;
+
+import mage.abilities.Ability;
+import mage.abilities.condition.Condition;
+import mage.game.Game;
+import mage.watchers.common.DiscardedCardWatcher;
+
+/**
+ * @author TheElk801
+ */
+public enum ControllerDiscardedThisTurnCondition implements Condition {
+    instance;
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        return DiscardedCardWatcher.checkPlayerDiscarded(source.getControllerId(), game);
+    }
+}

Mage/src/main/java/mage/abilities/hint/common/ControllerDiscardedHint.java

@@ -0,0 +1,28 @@
+package mage.abilities.hint.common;
+
+import mage.abilities.Ability;
+import mage.abilities.condition.common.ControllerDiscardedThisTurnCondition;
+import mage.abilities.hint.ConditionHint;
+import mage.abilities.hint.Hint;
+import mage.game.Game;
+
+/**
+ * @author TheElk801
+ */
+public enum ControllerDiscardedHint implements Hint {
+    instance;
+
+    private static final Hint hint = new ConditionHint(
+            ControllerDiscardedThisTurnCondition.instance, "You discarded a card this turn"
+    );
+
+    @Override
+    public String getText(Game game, Ability ability) {
+        return hint.getText(game, ability);
+    }
+
+    @Override
+    public ControllerDiscardedHint copy() {
+        return instance;
+    }
+}

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

@@ -0,0 +1,40 @@
+package mage.watchers.common;
+
+import mage.constants.WatcherScope;
+import mage.game.Game;
+import mage.game.events.GameEvent;
+import mage.watchers.Watcher;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.UUID;
+
+/**
+ * @author TheElk801
+ */
+public class DiscardedCardWatcher extends Watcher {
+
+    private final Map<UUID, Integer> playerMap = new HashMap<>();
+
+    public DiscardedCardWatcher() {
+        super(WatcherScope.GAME);
+    }
+
+    @Override
+    public void watch(GameEvent event, Game game) {
+        if (event.getType() == GameEvent.EventType.DISCARDED_CARD) {
+            playerMap.compute(event.getPlayerId(), (u, i) -> i == null ? 1 : Integer.sum(i, 1));
+        }
+    }
+
+    @Override
+    public void reset() {
+        playerMap.clear();
+        super.reset();
+    }
+
+    public static boolean checkPlayerDiscarded(UUID playerId, Game game) {
+        DiscardedCardWatcher watcher = game.getState().getWatcher(DiscardedCardWatcher.class);
+        return watcher != null && watcher.playerMap.getOrDefault(playerId, 0) > 0;
+    }
+}