[ONE] Implement Black Sun's Twilight

Mage.Sets/src/mage/cards/b/BlackSunsTwilight.java

@@ -0,0 +1,88 @@
+package mage.cards.b;
+
+import java.util.UUID;
+
+import mage.abilities.Ability;
+import mage.abilities.dynamicvalue.common.ManacostVariableValue;
+import mage.abilities.effects.OneShotEffect;
+import mage.abilities.effects.common.continuous.BoostTargetEffect;
+import mage.cards.Card;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.*;
+import mage.filter.FilterCard;
+import mage.filter.common.FilterCreatureCard;
+import mage.filter.predicate.mageobject.ManaValuePredicate;
+import mage.game.Game;
+import mage.players.Player;
+import mage.target.TargetCard;
+import mage.target.common.TargetCardInYourGraveyard;
+import mage.target.common.TargetCreaturePermanent;
+
+/**
+ * @author TheElk801
+ */
+public final class BlackSunsTwilight extends CardImpl {
+
+    public BlackSunsTwilight(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.INSTANT}, "{X}{B}");
+
+        // Up to one target creature gets -X/-X until end of turn. If X is 5 or more, return a creature card with mana value X or less from your graveyard to the battlefield tapped.
+        this.getSpellAbility().addEffect(new BoostTargetEffect(
+                ManacostVariableValue.REGULAR, ManacostVariableValue.REGULAR, Duration.EndOfTurn
+        ));
+        this.getSpellAbility().addEffect(new BlackSunsTwilightEffect());
+        this.getSpellAbility().addTarget(new TargetCreaturePermanent(0, 1));
+    }
+
+    private BlackSunsTwilight(final BlackSunsTwilight card) {
+        super(card);
+    }
+
+    @Override
+    public BlackSunsTwilight copy() {
+        return new BlackSunsTwilight(this);
+    }
+}
+
+class BlackSunsTwilightEffect extends OneShotEffect {
+
+    BlackSunsTwilightEffect() {
+        super(Outcome.Benefit);
+        staticText = "If X is 5 or more, return a creature card with mana value " +
+                "X or less from your graveyard to the battlefield tapped";
+    }
+
+    private BlackSunsTwilightEffect(final BlackSunsTwilightEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public BlackSunsTwilightEffect copy() {
+        return new BlackSunsTwilightEffect(this);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        Player player = game.getPlayer(source.getControllerId());
+        int xValue = source.getManaCostsToPay().getX();
+        if (player == null || xValue < 5) {
+            return false;
+        }
+        FilterCard filter = new FilterCreatureCard(
+                "creature card with mana value " + xValue + " or less from your graveyard"
+        );
+        filter.add(new ManaValuePredicate(ComparisonType.FEWER_THAN, xValue + 1));
+        if (player.getGraveyard().count(filter, game) < 1) {
+            return false;
+        }
+        TargetCard target = new TargetCardInYourGraveyard(filter);
+        target.setNotTarget(true);
+        player.choose(outcome, target, source, game);
+        Card card = game.getCard(target.getFirstTarget());
+        return card != null && player.moveCards(
+                card, Zone.BATTLEFIELD, source, game,
+                true, false, false, null
+        );
+    }
+}

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

@@ -21,6 +21,7 @@ public final class PhyrexiaAllWillBeOne extends ExpansionSet {
         this.hasBoosters = false; // temporary
 
         cards.add(new SetCardInfo("Argentum Masticore", 222, Rarity.RARE, mage.cards.a.ArgentumMasticore.class));
+        cards.add(new SetCardInfo("Black Sun's Twilight", 84, Rarity.RARE, mage.cards.b.BlackSunsTwilight.class));
         cards.add(new SetCardInfo("Blackcleave Cliffs", 248, Rarity.RARE, mage.cards.b.BlackcleaveCliffs.class));
         cards.add(new SetCardInfo("Bloated Contaminator", 159, Rarity.RARE, mage.cards.b.BloatedContaminator.class));
         cards.add(new SetCardInfo("Blue Sun's Twilight", 43, Rarity.RARE, mage.cards.b.BlueSunsTwilight.class));