Implemented Carrion Grub

Mage.Sets/src/mage/cards/c/CarrionGrub.java

@@ -0,0 +1,89 @@
+package mage.cards.c;
+
+import mage.MageInt;
+import mage.MageObject;
+import mage.abilities.Ability;
+import mage.abilities.common.EntersBattlefieldTriggeredAbility;
+import mage.abilities.common.SimpleStaticAbility;
+import mage.abilities.dynamicvalue.DynamicValue;
+import mage.abilities.dynamicvalue.common.StaticValue;
+import mage.abilities.effects.Effect;
+import mage.abilities.effects.common.PutTopCardOfLibraryIntoGraveControllerEffect;
+import mage.abilities.effects.common.continuous.BoostSourceEffect;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.constants.Duration;
+import mage.constants.SubType;
+import mage.game.Game;
+import mage.players.Player;
+
+import java.util.Objects;
+import java.util.UUID;
+
+/**
+ * @author TheElk801
+ */
+public final class CarrionGrub extends CardImpl {
+
+    public CarrionGrub(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{3}{B}");
+
+        this.subtype.add(SubType.INSECT);
+        this.power = new MageInt(0);
+        this.toughness = new MageInt(5);
+
+        // Carrion Grub gets +X/+0, where X is the greatest power among creature cards in your graveyard.
+        this.addAbility(new SimpleStaticAbility(new BoostSourceEffect(
+                CarrionGrubValue.instance, StaticValue.get(0), Duration.WhileOnBattlefield
+        )));
+
+        // When Carrion Grub enters the battlefield, mill four cards.
+        this.addAbility(new EntersBattlefieldTriggeredAbility(new PutTopCardOfLibraryIntoGraveControllerEffect(4)));
+    }
+
+    private CarrionGrub(final CarrionGrub card) {
+        super(card);
+    }
+
+    @Override
+    public CarrionGrub copy() {
+        return new CarrionGrub(this);
+    }
+}
+
+enum CarrionGrubValue implements DynamicValue {
+    instance;
+
+    @Override
+    public int calculate(Game game, Ability sourceAbility, Effect effect) {
+        Player player = game.getPlayer(sourceAbility.getControllerId());
+        if (player == null) {
+            return 0;
+        }
+        return player.getGraveyard()
+                .getCards(game)
+                .stream()
+                .filter(Objects::nonNull)
+                .filter(MageObject::isCreature)
+                .map(MageObject::getPower)
+                .mapToInt(MageInt::getValue)
+                .max()
+                .orElse(0);
+    }
+
+    @Override
+    public CarrionGrubValue copy() {
+        return instance;
+    }
+
+    @Override
+    public String getMessage() {
+        return "the greatest power among creature cards in your graveyard";
+    }
+
+    @Override
+    public String toString() {
+        return "X";
+    }
+}

Mage.Sets/src/mage/sets/CoreSet2021.java

@@ -39,6 +39,7 @@ public final class CoreSet2021 extends ExpansionSet {
         cards.add(new SetCardInfo("Baneslayer Angel", 6, Rarity.MYTHIC, mage.cards.b.BaneslayerAngel.class));
         cards.add(new SetCardInfo("Basri's Aegis", 322, Rarity.RARE, mage.cards.b.BasrisAegis.class));
         cards.add(new SetCardInfo("Basri, Devoted Paladin", 320, Rarity.MYTHIC, mage.cards.b.BasriDevotedPaladin.class));
+        cards.add(new SetCardInfo("Carrion Grub", 92, Rarity.UNCOMMON, mage.cards.c.CarrionGrub.class));
         cards.add(new SetCardInfo("Chandra's Firemaw", 333, Rarity.RARE, mage.cards.c.ChandrasFiremaw.class));
         cards.add(new SetCardInfo("Chandra, Flame's Catalyst", 332, Rarity.MYTHIC, mage.cards.c.ChandraFlamesCatalyst.class));
         cards.add(new SetCardInfo("Chromatic Orrery", 228, Rarity.MYTHIC, mage.cards.c.ChromaticOrrery.class));

Mage/src/main/java/mage/abilities/effects/common/PutTopCardOfLibraryIntoGraveControllerEffect.java

@@ -42,15 +42,6 @@ public class PutTopCardOfLibraryIntoGraveControllerEffect extends OneShotEffect
     }
 
     private String setText() {
-        StringBuilder sb = new StringBuilder("put the top");
-        if (numberCards == 1) {
-            sb.append(" card");
-        } else {
-            sb.append(" ");
-            sb.append(CardUtil.numberToText(numberCards));
-            sb.append(" cards");
-        }
-        sb.append(" of your library into your graveyard");
-        return sb.toString();
+        return "mill " + (numberCards == 1 ? "a card" : CardUtil.numberToText(numberCards) + " cards");
     }
 }