[DSC] Implement Fear of Sleep Paralysis

Also fix UntapSourceCost to allow 'consuming a stun counter' to count as paying untap cost, per rule 118.11, but only if Fear of Sleep Paralysis isn't making stun permanent.

Mage.Sets/src/mage/cards/f/FearOfSleepParalysis.java

@@ -0,0 +1,92 @@
+package mage.cards.f;
+
+import java.util.UUID;
+import mage.MageInt;
+import mage.abilities.Ability;
+import mage.abilities.abilityword.EerieAbility;
+import mage.abilities.common.SimpleStaticAbility;
+import mage.abilities.effects.ReplacementEffectImpl;
+import mage.abilities.effects.common.TapTargetEffect;
+import mage.abilities.effects.common.counter.AddCountersTargetEffect;
+import mage.constants.Duration;
+import mage.constants.Outcome;
+import mage.constants.SubType;
+import mage.abilities.keyword.FlyingAbility;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.counters.CounterType;
+import mage.game.Game;
+import mage.game.events.GameEvent;
+import mage.game.permanent.Permanent;
+import mage.target.common.TargetCreaturePermanent;
+
+/**
+ *
+ * @author Grath
+ */
+public final class FearOfSleepParalysis extends CardImpl {
+
+    public FearOfSleepParalysis(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.ENCHANTMENT, CardType.CREATURE}, "{5}{U}");
+        
+        this.subtype.add(SubType.NIGHTMARE);
+        this.power = new MageInt(6);
+        this.toughness = new MageInt(6);
+
+        // Flying
+        this.addAbility(FlyingAbility.getInstance());
+
+        // Eerie -- Whenever Fear of Sleep Paralysis or another enchantment you control enters and whenever you fully unlock a Room, tap up to one target creature and put a stun counter on it.
+        Ability ability = new  EerieAbility(new TapTargetEffect());
+        ability.addEffect(new AddCountersTargetEffect(CounterType.STUN.createInstance()).setText("and put a stun counter on it"));
+        ability.addTarget(new TargetCreaturePermanent(0, 1));
+        this.addAbility(ability);
+
+        // Stun counters can't be removed from permanents your opponents control.
+        this.addAbility(new SimpleStaticAbility(new FearOfSleepParalysisEffect()));
+    }
+
+    private FearOfSleepParalysis(final FearOfSleepParalysis card) {
+        super(card);
+    }
+
+    @Override
+    public FearOfSleepParalysis copy() {
+        return new FearOfSleepParalysis(this);
+    }
+}
+
+class FearOfSleepParalysisEffect extends ReplacementEffectImpl {
+
+    FearOfSleepParalysisEffect() {
+        super(Duration.WhileOnBattlefield, Outcome.PreventDamage);
+        staticText = "Stun counters can't be removed from permanents your opponents control";
+    }
+
+    private FearOfSleepParalysisEffect(final FearOfSleepParalysisEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public FearOfSleepParalysisEffect copy() {
+        return new FearOfSleepParalysisEffect(this);
+    }
+
+    @Override
+    public boolean replaceEvent(GameEvent event, Ability source, Game game) {
+        return true;
+    }
+
+    @Override
+    public boolean checksEventType(GameEvent event, Game game) {
+        return event.getType() == GameEvent.EventType.REMOVE_COUNTERS;
+    }
+
+    @Override
+    public boolean applies(GameEvent event, Ability source, Game game) {
+        Permanent target = game.getPermanent(event.getTargetId());
+        return target != null && event.getData().equals(CounterType.STUN.getName()) && !target.getControllerId().equals(source.getControllerId());
+    }
+
+}

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

@@ -107,6 +107,7 @@ public final class DuskmournHouseOfHorrorCommander extends ExpansionSet {
         cards.add(new SetCardInfo("Ezuri's Predation", 178, Rarity.RARE, mage.cards.e.EzurisPredation.class));
         cards.add(new SetCardInfo("Falkenrath Noble", 140, Rarity.UNCOMMON, mage.cards.f.FalkenrathNoble.class));
         cards.add(new SetCardInfo("Fate Unraveler", 141, Rarity.RARE, mage.cards.f.FateUnraveler.class));
+        cards.add(new SetCardInfo("Fear of Sleep Paralysis", 12, Rarity.RARE, mage.cards.f.FearOfSleepParalysis.class));
         cards.add(new SetCardInfo("Feed the Swarm", 78, Rarity.COMMON, mage.cards.f.FeedTheSwarm.class));
         cards.add(new SetCardInfo("Fellwar Stone", 245, Rarity.UNCOMMON, mage.cards.f.FellwarStone.class));
         cards.add(new SetCardInfo("Flooded Grove", 276, Rarity.RARE, mage.cards.f.FloodedGrove.class));

Mage/src/main/java/mage/abilities/costs/common/UntapSourceCost.java

@@ -6,6 +6,7 @@ import mage.abilities.Ability;
 import mage.abilities.costs.Cost;
 import mage.abilities.costs.CostImpl;
 import mage.constants.AsThoughEffectType;
+import mage.counters.CounterType;
 import mage.game.Game;
 import mage.game.permanent.Permanent;
 
@@ -27,7 +28,13 @@ public class UntapSourceCost extends CostImpl {
     public boolean pay(Ability ability, Game game, Ability source, UUID controllerId, boolean noMana, Cost costToPay) {
         Permanent permanent = game.getPermanent(source.getSourceId());
         if (permanent != null) {
+            int stunCount = permanent.getCounters(game).getCount(CounterType.STUN);
             paid = permanent.untap(game);
+            // 118.11 - if a stun counter replaces the untap, the cost has still been paid.
+            // Fear of Sleep Paralysis ruling - if the stun counter can't be removed, the untap cost hasn't been paid.
+            if (stunCount > 0) {
+                paid = permanent.getCounters(game).getCount(CounterType.STUN) < stunCount;
+            }
         }
         return paid;
     }