From dd6aaccca5887db54420228ecfaad44cb9a14774 Mon Sep 17 00:00:00 2001
From: Evan Kranzler <theelk801@gmail.com>
Date: Fri, 2 Aug 2019 08:17:38 -0400
Subject: [PATCH] Implemntd Kadena, Slinking Sorcerer

---
 .../mage/cards/k/KadenaSlinkingSorcerer.java  | 132 ++++++++++++++++++
 .../src/mage/sets/Commander2019Edition.java   |   1 +
 2 files changed, 133 insertions(+)
 create mode 100644 Mage.Sets/src/mage/cards/k/KadenaSlinkingSorcerer.java

diff --git a/Mage.Sets/src/mage/cards/k/KadenaSlinkingSorcerer.java b/Mage.Sets/src/mage/cards/k/KadenaSlinkingSorcerer.java
new file mode 100644
index 0000000000..60d0086bc7
--- /dev/null
+++ b/Mage.Sets/src/mage/cards/k/KadenaSlinkingSorcerer.java
@@ -0,0 +1,132 @@
+package mage.cards.k;
+
+import mage.MageInt;
+import mage.abilities.common.EntersBattlefieldControlledTriggeredAbility;
+import mage.abilities.common.SimpleStaticAbility;
+import mage.abilities.effects.common.DrawCardSourceControllerEffect;
+import mage.abilities.effects.common.cost.SpellsCostReductionControllerEffect;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.constants.SubType;
+import mage.constants.SuperType;
+import mage.constants.WatcherScope;
+import mage.filter.FilterCard;
+import mage.filter.FilterPermanent;
+import mage.filter.common.FilterControlledCreaturePermanent;
+import mage.filter.predicate.ObjectPlayer;
+import mage.filter.predicate.ObjectPlayerPredicate;
+import mage.filter.predicate.other.FaceDownPredicate;
+import mage.game.Controllable;
+import mage.game.Game;
+import mage.game.events.GameEvent;
+import mage.game.stack.Spell;
+import mage.watchers.Watcher;
+
+import java.util.HashSet;
+import java.util.Set;
+import java.util.UUID;
+
+/**
+ * @author TheElk801
+ */
+public final class KadenaSlinkingSorcerer extends CardImpl {
+
+    private static final FilterCard filter = new FilterCard();
+    private static final FilterPermanent filter2 = new FilterControlledCreaturePermanent("a face-down creature");
+
+    static {
+        filter.add(KadenaSlinkingSorcererPredicate.instance);
+        filter2.add(FaceDownPredicate.instance);
+    }
+
+    public KadenaSlinkingSorcerer(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{1}{B}{G}{U}");
+
+        this.addSuperType(SuperType.LEGENDARY);
+        this.subtype.add(SubType.NAGA);
+        this.subtype.add(SubType.WIZARD);
+        this.power = new MageInt(3);
+        this.toughness = new MageInt(3);
+
+        // The first face-down creature spell you cast each turn costs {3} less to cast.
+        this.addAbility(new SimpleStaticAbility(
+                new SpellsCostReductionControllerEffect(filter, 3)
+                        .setText("The first face-down creature spell you cast each turn costs {3} less to cast.")
+        ), new KadenaSlinkingSorcererWatcher());
+
+        // Whenever a face-down creature enters the battlefield under your control, draw a card.
+        this.addAbility(new EntersBattlefieldControlledTriggeredAbility(
+                new DrawCardSourceControllerEffect(1), filter2
+        ));
+    }
+
+    private KadenaSlinkingSorcerer(final KadenaSlinkingSorcerer card) {
+        super(card);
+    }
+
+    @Override
+    public KadenaSlinkingSorcerer copy() {
+        return new KadenaSlinkingSorcerer(this);
+    }
+}
+
+enum KadenaSlinkingSorcererPredicate implements ObjectPlayerPredicate<ObjectPlayer<Controllable>> {
+    instance;
+
+    @Override
+    public boolean apply(ObjectPlayer<Controllable> input, Game game) {
+        if (input.getObject() instanceof Spell
+                && ((Spell) input.getObject()).isCreature()
+                && ((Spell) input.getObject()).isFaceDown(game)) {
+            KadenaSlinkingSorcererWatcher watcher = game.getState().getWatcher(KadenaSlinkingSorcererWatcher.class);
+            return watcher != null && watcher.castFaceDownThisTurn(input.getPlayerId());
+        }
+        return false;
+    }
+}
+
+class KadenaSlinkingSorcererWatcher extends Watcher {
+
+
+    private final Set<UUID> castFaceDown;
+
+    KadenaSlinkingSorcererWatcher() {
+        super(WatcherScope.GAME);
+        castFaceDown = new HashSet<>();
+    }
+
+    private KadenaSlinkingSorcererWatcher(final KadenaSlinkingSorcererWatcher watcher) {
+        super(watcher);
+        this.castFaceDown = new HashSet<>();
+        castFaceDown.addAll(watcher.castFaceDown);
+    }
+
+    @Override
+    public void watch(GameEvent event, Game game) {
+        if (event.getType() != GameEvent.EventType.SPELL_CAST) {
+            return;
+        }
+        Spell spell = (Spell) game.getObject(event.getTargetId());
+        if (spell == null || !spell.isCreature() || !spell.isFaceDown(game)) {
+            return;
+        }
+        castFaceDown.add(event.getPlayerId());
+    }
+
+    boolean castFaceDownThisTurn(UUID playerId) {
+        return castFaceDown.contains(playerId);
+    }
+
+    @Override
+    public KadenaSlinkingSorcererWatcher copy() {
+        return new KadenaSlinkingSorcererWatcher(this);
+    }
+
+    @Override
+    public void reset() {
+        super.reset();
+        castFaceDown.clear();
+    }
+
+}
diff --git a/Mage.Sets/src/mage/sets/Commander2019Edition.java b/Mage.Sets/src/mage/sets/Commander2019Edition.java
index 57db79c495..7dad2d04b9 100644
--- a/Mage.Sets/src/mage/sets/Commander2019Edition.java
+++ b/Mage.Sets/src/mage/sets/Commander2019Edition.java
@@ -23,6 +23,7 @@ public final class Commander2019Edition extends ExpansionSet {
         cards.add(new SetCardInfo("Anje's Ravager", 22, Rarity.RARE, mage.cards.a.AnjesRavager.class));
         cards.add(new SetCardInfo("Ghired, Conclave Exile", 42, Rarity.MYTHIC, mage.cards.g.GhiredConclaveExile.class));
         cards.add(new SetCardInfo("Kadena's Silencer", 8, Rarity.RARE, mage.cards.k.KadenasSilencer.class));
+        cards.add(new SetCardInfo("Kadena, Slinking Sorcerer", 45, Rarity.MYTHIC, mage.cards.k.KadenaSlinkingSorcerer.class));
         cards.add(new SetCardInfo("Seedborn Muse", 179, Rarity.RARE, mage.cards.s.SeedbornMuse.class));
     }
 }