Implemented Ashiok, Nightmare Muse

Mage/src/main/java/mage/game/permanent/token/AshiokNightmareMuseToken.java

@@ -0,0 +1,79 @@
+package mage.game.permanent.token;
+
+import mage.MageInt;
+import mage.abilities.Ability;
+import mage.abilities.common.AttacksOrBlocksTriggeredAbility;
+import mage.abilities.effects.OneShotEffect;
+import mage.cards.Card;
+import mage.constants.CardType;
+import mage.constants.Outcome;
+import mage.constants.SubType;
+import mage.constants.Zone;
+import mage.game.Game;
+import mage.players.Player;
+
+import java.util.Collection;
+import java.util.Objects;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+/**
+ * @author TheElk801
+ */
+public final class AshiokNightmareMuseToken extends TokenImpl {
+
+    public AshiokNightmareMuseToken() {
+        super("Nightmare", "2/3 blue and black Nightmare creature token with " +
+                "\"Whenever this creature attacks or blocks, each opponent exiles the top two cards of their library.\"");
+        cardType.add(CardType.CREATURE);
+        color.setBlue(true);
+        color.setBlack(true);
+        subtype.add(SubType.NIGHTMARE);
+        power = new MageInt(2);
+        toughness = new MageInt(3);
+        this.addAbility(new AttacksOrBlocksTriggeredAbility(new AshiokNightmareMuseTokenEffect(), false));
+    }
+
+    private AshiokNightmareMuseToken(final AshiokNightmareMuseToken token) {
+        super(token);
+    }
+
+    public AshiokNightmareMuseToken copy() {
+        return new AshiokNightmareMuseToken(this);
+    }
+}
+
+class AshiokNightmareMuseTokenEffect extends OneShotEffect {
+
+    AshiokNightmareMuseTokenEffect() {
+        super(Outcome.Benefit);
+        staticText = "each opponent exiles the top two cards of their library.";
+    }
+
+    private AshiokNightmareMuseTokenEffect(final AshiokNightmareMuseTokenEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public AshiokNightmareMuseTokenEffect copy() {
+        return new AshiokNightmareMuseTokenEffect(this);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        Player player = game.getPlayer(source.getControllerId());
+        if (player == null) {
+            return false;
+        }
+        Set<Card> cards = game
+                .getOpponents(source.getControllerId())
+                .stream()
+                .map(game::getPlayer)
+                .filter(Objects::nonNull)
+                .map(Player::getLibrary)
+                .map(library -> library.getTopCards(game, 2))
+                .flatMap(Collection::stream)
+                .collect(Collectors.toSet());
+        return player.moveCards(cards, Zone.EXILED, source, game);
+    }
+}