Implemented Once Upon a Time

Mage.Sets/src/mage/cards/o/OnceUponATime.java

@@ -0,0 +1,106 @@
+package mage.cards.o;
+
+import mage.abilities.Ability;
+import mage.abilities.condition.Condition;
+import mage.abilities.costs.AlternativeCostSourceAbility;
+import mage.abilities.dynamicvalue.common.StaticValue;
+import mage.abilities.effects.common.LookLibraryAndPickControllerEffect;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.constants.WatcherScope;
+import mage.constants.Zone;
+import mage.filter.FilterCard;
+import mage.filter.predicate.Predicates;
+import mage.filter.predicate.mageobject.CardTypePredicate;
+import mage.game.Game;
+import mage.game.events.GameEvent;
+import mage.watchers.Watcher;
+
+import java.util.HashSet;
+import java.util.Set;
+import java.util.UUID;
+
+/**
+ * @author TheElk801
+ */
+public final class OnceUponATime extends CardImpl {
+
+    private static final FilterCard filter = new FilterCard("a creature or land card");
+
+    static {
+        filter.add(Predicates.or(
+                new CardTypePredicate(CardType.CREATURE),
+                new CardTypePredicate(CardType.LAND)
+        ));
+    }
+
+    public OnceUponATime(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.INSTANT}, "{1}{G}");
+
+        // If this spell is the first spell you've cast this game, you may cast it without paying its mana cost.
+        this.addAbility(new AlternativeCostSourceAbility(
+                null, OnceUponATimeCondition.instance, "If this spell is the first spell " +
+                "you've cast this game, you may cast it without paying its mana cost."
+        ), new OnceUponATimeWatcher());
+
+        // Look at the top five cards of your library. You may reveal a creature or land card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.
+        this.getSpellAbility().addEffect(new LookLibraryAndPickControllerEffect(
+                new StaticValue(5), false, new StaticValue(1), filter,
+                Zone.LIBRARY, false, true, false, Zone.HAND,
+                true, false, false
+        ).setBackInRandomOrder(true).setText("Look at the top five cards of your library. " +
+                "You may reveal a creature or land card from among them and put it into your hand. " +
+                "Put the rest on the bottom of your library in a random order."
+        ));
+    }
+
+    private OnceUponATime(final OnceUponATime card) {
+        super(card);
+    }
+
+    @Override
+    public OnceUponATime copy() {
+        return new OnceUponATime(this);
+    }
+}
+
+enum OnceUponATimeCondition implements Condition {
+    instance;
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        OnceUponATimeWatcher watcher = game.getState().getWatcher(OnceUponATimeWatcher.class);
+        return watcher != null && watcher.getSpellsCastThisTurn(source.getControllerId());
+    }
+}
+
+class OnceUponATimeWatcher extends Watcher {
+
+    private final Set<UUID> castSpells = new HashSet();
+
+    OnceUponATimeWatcher() {
+        super(WatcherScope.GAME);
+    }
+
+    private OnceUponATimeWatcher(final OnceUponATimeWatcher watcher) {
+        super(watcher);
+        this.castSpells.addAll(watcher.castSpells);
+    }
+
+    @Override
+    public OnceUponATimeWatcher copy() {
+        return new OnceUponATimeWatcher(this);
+    }
+
+    @Override
+    public void watch(GameEvent event, Game game) {
+        if (GameEvent.EventType.SPELL_CAST == event.getType()) {
+            castSpells.add(event.getPlayerId());
+        }
+    }
+
+    public boolean getSpellsCastThisTurn(UUID playerId) {
+        return !castSpells.contains(playerId);
+    }
+}

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

@@ -71,6 +71,7 @@ public final class ThroneOfEldraine extends ExpansionSet {
         cards.add(new SetCardInfo("Mystical Dispute", 58, Rarity.UNCOMMON, mage.cards.m.MysticalDispute.class));
         cards.add(new SetCardInfo("Oko's Accomplices", 310, Rarity.COMMON, mage.cards.o.OkosAccomplices.class));
         cards.add(new SetCardInfo("Oko, Thief of Crowns", 197, Rarity.MYTHIC, mage.cards.o.OkoThiefOfCrowns.class));
+        cards.add(new SetCardInfo("Once Upon a Time", 169, Rarity.RARE, mage.cards.o.OnceUponATime.class));
         cards.add(new SetCardInfo("Order of Midnight", 99, Rarity.UNCOMMON, mage.cards.o.OrderOfMidnight.class));
         cards.add(new SetCardInfo("Piper of the Swarm", 100, Rarity.RARE, mage.cards.p.PiperOfTheSwarm.class));
         cards.add(new SetCardInfo("Rankle, Master of Pranks", 101, Rarity.MYTHIC, mage.cards.r.RankleMasterOfPranks.class));